The problem is to solve the following five linear equations: 1. $8 - 8x = 9 - 9x$

AlgebraLinear EquationsSolving Equations
2025/6/10

1. Problem Description

The problem is to solve the following five linear equations:

1. $8 - 8x = 9 - 9x$

2. $2 - q = q - 4$

3. $2x + 5 = 3x - 7$

4. $13x - 12 = 5x + 60$

5. $3 + 3y = 1 - 13y$

2. Solution Steps

1. $8 - 8x = 9 - 9x$

Add 9x9x to both sides: 88x+9x=99x+9x8 - 8x + 9x = 9 - 9x + 9x which simplifies to 8+x=98 + x = 9.
Subtract 8 from both sides: 8+x8=988 + x - 8 = 9 - 8 which simplifies to x=1x = 1.

2. $2 - q = q - 4$

Add qq to both sides: 2q+q=q4+q2 - q + q = q - 4 + q which simplifies to 2=2q42 = 2q - 4.
Add 4 to both sides: 2+4=2q4+42 + 4 = 2q - 4 + 4 which simplifies to 6=2q6 = 2q.
Divide both sides by 2: 62=2q2\frac{6}{2} = \frac{2q}{2} which simplifies to q=3q = 3.

3. $2x + 5 = 3x - 7$

Subtract 2x2x from both sides: 2x+52x=3x72x2x + 5 - 2x = 3x - 7 - 2x which simplifies to 5=x75 = x - 7.
Add 7 to both sides: 5+7=x7+75 + 7 = x - 7 + 7 which simplifies to 12=x12 = x. Therefore, x=12x = 12.

4. $13x - 12 = 5x + 60$

Subtract 5x5x from both sides: 13x125x=5x+605x13x - 12 - 5x = 5x + 60 - 5x which simplifies to 8x12=608x - 12 = 60.
Add 12 to both sides: 8x12+12=60+128x - 12 + 12 = 60 + 12 which simplifies to 8x=728x = 72.
Divide both sides by 8: 8x8=728\frac{8x}{8} = \frac{72}{8} which simplifies to x=9x = 9.

5. $3 + 3y = 1 - 13y$

Add 13y13y to both sides: 3+3y+13y=113y+13y3 + 3y + 13y = 1 - 13y + 13y which simplifies to 3+16y=13 + 16y = 1.
Subtract 3 from both sides: 3+16y3=133 + 16y - 3 = 1 - 3 which simplifies to 16y=216y = -2.
Divide both sides by 16: 16y16=216\frac{16y}{16} = \frac{-2}{16} which simplifies to y=18y = -\frac{1}{8}.

3. Final Answer

1. $x = 1$

2. $q = 3$

3. $x = 12$

4. $x = 9$

5. $y = -\frac{1}{8}$