X+20+X-10=180

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Solution for X+20+X-10=180 equation: 


Simplifying
X + 20 + X + -10 = 180

Reorder the terms:
20 + -10 + X + X = 180

Combine like terms: 20 + -10 = 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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