X+99=90

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Solution for X+99=90 equation: 


Simplifying
X + 99 = 90

Reorder the terms:
99 + X = 90

Solving
99 + X = 90

Solving for variable 'X'.

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

Add '-99' to each side of the equation.
99 + -99 + X = 90 + -99

Combine like terms: 99 + -99 = 0
0 + X = 90 + -99
X = 90 + -99

Combine like terms: 90 + -99 = -9
X = -9

Simplifying
X = -9

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