(50-x)+(9x-40)+90=180

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Solution for (50-x)+(9x-40)+90=180 equation: 


Simplifying
(50 + -1x) + (9x + -40) + 90 = 180

Remove parenthesis around (50 + -1x)
50 + -1x + (9x + -40) + 90 = 180

Reorder the terms:
50 + -1x + (-40 + 9x) + 90 = 180

Remove parenthesis around (-40 + 9x)
50 + -1x + -40 + 9x + 90 = 180

Reorder the terms:
50 + -40 + 90 + -1x + 9x = 180

Combine like terms: 50 + -40 = 10
10 + 90 + -1x + 9x = 180

Combine like terms: 10 + 90 = 100
100 + -1x + 9x = 180

Combine like terms: -1x + 9x = 8x
100 + 8x = 180

Solving
100 + 8x = 180

Solving for variable 'x'.

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

Add '-100' to each side of the equation.
100 + -100 + 8x = 180 + -100

Combine like terms: 100 + -100 = 0
0 + 8x = 180 + -100
8x = 180 + -100

Combine like terms: 180 + -100 = 80
8x = 80

Divide each side by '8'.
x = 10

Simplifying
x = 10

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