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

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


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

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

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

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

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

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

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

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

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

Combine like terms: -15 + 15 = 0
0 + 10x + x + x = 180
10x + x + x = 180

Combine like terms: 10x + x = 11x
11x + x = 180

Combine like terms: 11x + x = 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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