3x+x-6=90

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Solution for 3x+x-6=90 equation: 


Simplifying
3x + x + -6 = 90

Reorder the terms:
-6 + 3x + x = 90

Combine like terms: 3x + x = 4x
-6 + 4x = 90

Solving
-6 + 4x = 90

Solving for variable 'x'.

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

Add '6' to each side of the equation.
-6 + 6 + 4x = 90 + 6

Combine like terms: -6 + 6 = 0
0 + 4x = 90 + 6
4x = 90 + 6

Combine like terms: 90 + 6 = 96
4x = 96

Divide each side by '4'.
x = 24

Simplifying
x = 24

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