X+21=78

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Solution for X+21=78 equation: 


Simplifying
X + 21 = 78

Reorder the terms:
21 + X = 78

Solving
21 + X = 78

Solving for variable 'X'.

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

Add '-21' to each side of the equation.
21 + -21 + X = 78 + -21

Combine like terms: 21 + -21 = 0
0 + X = 78 + -21
X = 78 + -21

Combine like terms: 78 + -21 = 57
X = 57

Simplifying
X = 57

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