60+60+(X-20)=180

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Solution for 60+60+(X-20)=180 equation: 


Simplifying
60 + 60 + (X + -20) = 180

Reorder the terms:
60 + 60 + (-20 + X) = 180

Remove parenthesis around (-20 + X)
60 + 60 + -20 + X = 180

Combine like terms: 60 + 60 = 120
120 + -20 + X = 180

Combine like terms: 120 + -20 = 100
100 + X = 180

Solving
100 + X = 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 + X = 180 + -100

Combine like terms: 100 + -100 = 0
0 + X = 180 + -100
X = 180 + -100

Combine like terms: 180 + -100 = 80
X = 80

Simplifying
X = 80

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