X+78=90

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Solution for X+78=90 equation: 


Simplifying
X + 78 = 90

Reorder the terms:
78 + X = 90

Solving
78 + X = 90

Solving for variable 'X'.

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

Add '-78' to each side of the equation.
78 + -78 + X = 90 + -78

Combine like terms: 78 + -78 = 0
0 + X = 90 + -78
X = 90 + -78

Combine like terms: 90 + -78 = 12
X = 12

Simplifying
X = 12

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