3x+x+45+9x-21=180

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Solution for 3x+x+45+9x-21=180 equation:


Simplifying
3x + x + 45 + 9x + -21 = 180

Reorder the terms:
45 + -21 + 3x + x + 9x = 180

Combine like terms: 45 + -21 = 24
24 + 3x + x + 9x = 180

Combine like terms: 3x + x = 4x
24 + 4x + 9x = 180

Combine like terms: 4x + 9x = 13x
24 + 13x = 180

Solving
24 + 13x = 180

Solving for variable 'x'.

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

Add '-24' to each side of the equation.
24 + -24 + 13x = 180 + -24

Combine like terms: 24 + -24 = 0
0 + 13x = 180 + -24
13x = 180 + -24

Combine like terms: 180 + -24 = 156
13x = 156

Divide each side by '13'.
x = 12

Simplifying
x = 12

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