78-x=21

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Solution for 78-x=21 equation: 


Simplifying
78 + -1x = 21

Solving
78 + -1x = 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 + -1x = 21 + -78

Combine like terms: 78 + -78 = 0
0 + -1x = 21 + -78
-1x = 21 + -78

Combine like terms: 21 + -78 = -57
-1x = -57

Divide each side by '-1'.
x = 57

Simplifying
x = 57

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