21-x=30

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Solution for 21-x=30 equation: 


Simplifying
21 + -1x = 30

Solving
21 + -1x = 30

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 + -1x = 30 + -21

Combine like terms: 21 + -21 = 0
0 + -1x = 30 + -21
-1x = 30 + -21

Combine like terms: 30 + -21 = 9
-1x = 9

Divide each side by '-1'.
x = -9

Simplifying
x = -9

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