(21+2x)+(x+84)=180

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Solution for (21+2x)+(x+84)=180 equation: 


Simplifying
(21 + 2x) + (x + 84) = 180

Remove parenthesis around (21 + 2x)
21 + 2x + (x + 84) = 180

Reorder the terms:
21 + 2x + (84 + x) = 180

Remove parenthesis around (84 + x)
21 + 2x + 84 + x = 180

Reorder the terms:
21 + 84 + 2x + x = 180

Combine like terms: 21 + 84 = 105
105 + 2x + x = 180

Combine like terms: 2x + x = 3x
105 + 3x = 180

Solving
105 + 3x = 180

Solving for variable 'x'.

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

Add '-105' to each side of the equation.
105 + -105 + 3x = 180 + -105

Combine like terms: 105 + -105 = 0
0 + 3x = 180 + -105
3x = 180 + -105

Combine like terms: 180 + -105 = 75
3x = 75

Divide each side by '3'.
x = 25

Simplifying
x = 25

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