80-80-x=90

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Solution for 80-80-x=90 equation: 


Simplifying
80 + -80 + -1x = 90

Combine like terms: 80 + -80 = 0
0 + -1x = 90
-1x = 90

Solving
-1x = 90

Solving for variable 'x'.

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

Divide each side by '-1'.
x = -90

Simplifying
x = -90

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