90+20-10+x+x=180

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Solution for 90+20-10+x+x=180 equation: 


Simplifying
90 + 20 + -10 + x + x = 180

Combine like terms: 90 + 20 = 110
110 + -10 + x + x = 180

Combine like terms: 110 + -10 = 100
100 + x + x = 180

Combine like terms: x + x = 2x
100 + 2x = 180

Solving
100 + 2x = 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 + 2x = 180 + -100

Combine like terms: 100 + -100 = 0
0 + 2x = 180 + -100
2x = 180 + -100

Combine like terms: 180 + -100 = 80
2x = 80

Divide each side by '2'.
x = 40

Simplifying
x = 40

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