9x-78+x=42

Solution for 9x-78+x=42 equation:

Simplifying
9x + -78 + x = 42

Reorder the terms:
-78 + 9x + x = 42

Combine like terms: 9x + x = 10x
-78 + 10x = 42

Solving
-78 + 10x = 42

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '78' to each side of the equation.
-78 + 78 + 10x = 42 + 78

Combine like terms: -78 + 78 = 0
0 + 10x = 42 + 78
10x = 42 + 78

Combine like terms: 42 + 78 = 120
10x = 120

Divide each side by '10'.
x = 12

Simplifying
x = 12