-x+21=8.5

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Solution for -x+21=8.5 equation: 


Simplifying
-1x + 21 = 8.5

Reorder the terms:
21 + -1x = 8.5

Solving
21 + -1x = 8.5

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 = 8.5 + -21

Combine like terms: 21 + -21 = 0
0 + -1x = 8.5 + -21
-1x = 8.5 + -21

Combine like terms: 8.5 + -21 = -12.5
-1x = -12.5

Divide each side by '-1'.
x = 12.5

Simplifying
x = 12.5

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