15x+3x-12=78

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Solution for 15x+3x-12=78 equation:


Simplifying
15x + 3x + -12 = 78

Reorder the terms:
-12 + 15x + 3x = 78

Combine like terms: 15x + 3x = 18x
-12 + 18x = 78

Solving
-12 + 18x = 78

Solving for variable 'x'.

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

Add '12' to each side of the equation.
-12 + 12 + 18x = 78 + 12

Combine like terms: -12 + 12 = 0
0 + 18x = 78 + 12
18x = 78 + 12

Combine like terms: 78 + 12 = 90
18x = 90

Divide each side by '18'.
x = 5

Simplifying
x = 5

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