221-x=90

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Solution for 221-x=90 equation: 


Simplifying
221 + -1x = 90

Solving
221 + -1x = 90

Solving for variable 'x'.

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

Add '-221' to each side of the equation.
221 + -221 + -1x = 90 + -221

Combine like terms: 221 + -221 = 0
0 + -1x = 90 + -221
-1x = 90 + -221

Combine like terms: 90 + -221 = -131
-1x = -131

Divide each side by '-1'.
x = 131

Simplifying
x = 131

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