-r+7=-21

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Solution for -r+7=-21 equation: 


Simplifying
-1r + 7 = -21

Reorder the terms:
7 + -1r = -21

Solving
7 + -1r = -21

Solving for variable 'r'.

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

Add '-7' to each side of the equation.
7 + -7 + -1r = -21 + -7

Combine like terms: 7 + -7 = 0
0 + -1r = -21 + -7
-1r = -21 + -7

Combine like terms: -21 + -7 = -28
-1r = -28

Divide each side by '-1'.
r = 28

Simplifying
r = 28

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