120-X=.25*80

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Solution for 120-X=.25*80 equation: 


Simplifying
120 + -1X = 0.25 * 80

Multiply 0.25 * 80
120 + -1X = 20

Solving
120 + -1X = 20

Solving for variable 'X'.

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

Add '-120' to each side of the equation.
120 + -120 + -1X = 20 + -120

Combine like terms: 120 + -120 = 0
0 + -1X = 20 + -120
-1X = 20 + -120

Combine like terms: 20 + -120 = -100
-1X = -100

Divide each side by '-1'.
X = 100

Simplifying
X = 100

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