Simplify 15x + 7 + 3x to 18x + 7
8 - 9x = 18x + 7
Add 9x to both sides
8 = 18x + 7 + 9x
Simplify 18x + 7 + 9x to 27x to 7
8 = 27x + 7
Subtract 7 from both sides
8 - 7 = 27x
Simplify 8 - 7 to 1
1 = 27x
Divide both sides by 27
1/27 = x
Switch sides
x = 1/27
