x+90=21

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Solution for x+90=21 equation: 


Simplifying
x + 90 = 21

Reorder the terms:
90 + x = 21

Solving
90 + x = 21

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 + x = 21 + -90

Combine like terms: 90 + -90 = 0
0 + x = 21 + -90
x = 21 + -90

Combine like terms: 21 + -90 = -69
x = -69

Simplifying
x = -69

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