20-X=90

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Solution for 20-X=90 equation: 


Simplifying
20 + -1X = 90

Solving
20 + -1X = 90

Solving for variable 'X'.

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

Add '-20' to each side of the equation.
20 + -20 + -1X = 90 + -20

Combine like terms: 20 + -20 = 0
0 + -1X = 90 + -20
-1X = 90 + -20

Combine like terms: 90 + -20 = 70
-1X = 70

Divide each side by '-1'.
X = -70

Simplifying
X = -70

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