-X+21=8

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Solution for -X+21=8 equation:


Simplifying
-1X + 21 = 8

Reorder the terms:
21 + -1X = 8

Solving
21 + -1X = 8

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 = 8 + -21

Combine like terms: 21 + -21 = 0
0 + -1X = 8 + -21
-1X = 8 + -21

Combine like terms: 8 + -21 = -13
-1X = -13

Divide each side by '-1'.
X = 13

Simplifying
X = 13

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