5x+x+12=90

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Solution for 5x+x+12=90 equation: 


Simplifying
5x + x + 12 = 90

Reorder the terms:
12 + 5x + x = 90

Combine like terms: 5x + x = 6x
12 + 6x = 90

Solving
12 + 6x = 90

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 + 6x = 90 + -12

Combine like terms: 12 + -12 = 0
0 + 6x = 90 + -12
6x = 90 + -12

Combine like terms: 90 + -12 = 78
6x = 78

Divide each side by '6'.
x = 13

Simplifying
x = 13

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