78+2x+(x+21)=180

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Solution for 78+2x+(x+21)=180 equation: 


Simplifying
78 + 2x + (x + 21) = 180

Reorder the terms:
78 + 2x + (21 + x) = 180

Remove parenthesis around (21 + x)
78 + 2x + 21 + x = 180

Reorder the terms:
78 + 21 + 2x + x = 180

Combine like terms: 78 + 21 = 99
99 + 2x + x = 180

Combine like terms: 2x + x = 3x
99 + 3x = 180

Solving
99 + 3x = 180

Solving for variable 'x'.

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

Add '-99' to each side of the equation.
99 + -99 + 3x = 180 + -99

Combine like terms: 99 + -99 = 0
0 + 3x = 180 + -99
3x = 180 + -99

Combine like terms: 180 + -99 = 81
3x = 81

Divide each side by '3'.
x = 27

Simplifying
x = 27

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