(x-40)+(x-40)+90=180

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Solution for (x-40)+(x-40)+90=180 equation: 


Simplifying
(x + -40) + (x + -40) + 90 = 180

Reorder the terms:
(-40 + x) + (x + -40) + 90 = 180

Remove parenthesis around (-40 + x)
-40 + x + (x + -40) + 90 = 180

Reorder the terms:
-40 + x + (-40 + x) + 90 = 180

Remove parenthesis around (-40 + x)
-40 + x + -40 + x + 90 = 180

Reorder the terms:
-40 + -40 + 90 + x + x = 180

Combine like terms: -40 + -40 = -80
-80 + 90 + x + x = 180

Combine like terms: -80 + 90 = 10
10 + x + x = 180

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

Solving
10 + 2x = 180

Solving for variable 'x'.

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

Add '-10' to each side of the equation.
10 + -10 + 2x = 180 + -10

Combine like terms: 10 + -10 = 0
0 + 2x = 180 + -10
2x = 180 + -10

Combine like terms: 180 + -10 = 170
2x = 170

Divide each side by '2'.
x = 85

Simplifying
x = 85

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