51-x=21

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Solution for 51-x=21 equation: 


Simplifying
51 + -1x = 21

Solving
51 + -1x = 21

Solving for variable 'x'.

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

Add '-51' to each side of the equation.
51 + -51 + -1x = 21 + -51

Combine like terms: 51 + -51 = 0
0 + -1x = 21 + -51
-1x = 21 + -51

Combine like terms: 21 + -51 = -30
-1x = -30

Divide each side by '-1'.
x = 30

Simplifying
x = 30

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