(x+12)+(2x)=90

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Solution for (x+12)+(2x)=90 equation:


Simplifying
(x + 12) + (2x) = 90

Reorder the terms:
(12 + x) + (2x) = 90

Remove parenthesis around (12 + x)
12 + x + (2x) = 90

Combine like terms: x + (2x) = 3x
12 + 3x = 90

Solving
12 + 3x = 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 + 3x = 90 + -12

Combine like terms: 12 + -12 = 0
0 + 3x = 90 + -12
3x = 90 + -12

Combine like terms: 90 + -12 = 78
3x = 78

Divide each side by '3'.
x = 26

Simplifying
x = 26

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