(x+15)+(x+5)+(10x-20)=180

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Solution for (x+15)+(x+5)+(10x-20)=180 equation: 


Simplifying
(x + 15) + (x + 5) + (10x + -20) = 180

Reorder the terms:
(15 + x) + (x + 5) + (10x + -20) = 180

Remove parenthesis around (15 + x)
15 + x + (x + 5) + (10x + -20) = 180

Reorder the terms:
15 + x + (5 + x) + (10x + -20) = 180

Remove parenthesis around (5 + x)
15 + x + 5 + x + (10x + -20) = 180

Reorder the terms:
15 + x + 5 + x + (-20 + 10x) = 180

Remove parenthesis around (-20 + 10x)
15 + x + 5 + x + -20 + 10x = 180

Reorder the terms:
15 + 5 + -20 + x + x + 10x = 180

Combine like terms: 15 + 5 = 20
20 + -20 + x + x + 10x = 180

Combine like terms: 20 + -20 = 0
0 + x + x + 10x = 180
x + x + 10x = 180

Combine like terms: x + x = 2x
2x + 10x = 180

Combine like terms: 2x + 10x = 12x
12x = 180

Solving
12x = 180

Solving for variable 'x'.

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

Divide each side by '12'.
x = 15

Simplifying
x = 15

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