90-20x=80

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Solution for 90-20x=80 equation: 


Simplifying
90 + -20x = 80

Solving
90 + -20x = 80

Solving for variable 'x'.

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

Add '-90' to each side of the equation.
90 + -90 + -20x = 80 + -90

Combine like terms: 90 + -90 = 0
0 + -20x = 80 + -90
-20x = 80 + -90

Combine like terms: 80 + -90 = -10
-20x = -10

Divide each side by '-20'.
x = 0.5

Simplifying
x = 0.5

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