3x-9+x-7=90

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Solution for 3x-9+x-7=90 equation: 


Simplifying
3x + -9 + x + -7 = 90

Reorder the terms:
-9 + -7 + 3x + x = 90

Combine like terms: -9 + -7 = -16
-16 + 3x + x = 90

Combine like terms: 3x + x = 4x
-16 + 4x = 90

Solving
-16 + 4x = 90

Solving for variable 'x'.

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

Add '16' to each side of the equation.
-16 + 16 + 4x = 90 + 16

Combine like terms: -16 + 16 = 0
0 + 4x = 90 + 16
4x = 90 + 16

Combine like terms: 90 + 16 = 106
4x = 106

Divide each side by '4'.
x = 26.5

Simplifying
x = 26.5

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