x+78=21

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Solution for x+78=21 equation: 


Simplifying
x + 78 = 21

Reorder the terms:
78 + x = 21

Solving
78 + x = 21

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 = 21 + -78

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

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

Simplifying
x = -57

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