100-x=21

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Solution for 100-x=21 equation: 


Simplifying
100 + -1x = 21

Solving
100 + -1x = 21

Solving for variable 'x'.

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

Add '-100' to each side of the equation.
100 + -100 + -1x = 21 + -100

Combine like terms: 100 + -100 = 0
0 + -1x = 21 + -100
-1x = 21 + -100

Combine like terms: 21 + -100 = -79
-1x = -79

Divide each side by '-1'.
x = 79

Simplifying
x = 79

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