-21=-9+r

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Solution for -21=-9+r equation:


Simplifying
-21 = -9 + r

Solving
-21 = -9 + r

Solving for variable 'r'.

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

Add '-1r' to each side of the equation.
-21 + -1r = -9 + r + -1r

Combine like terms: r + -1r = 0
-21 + -1r = -9 + 0
-21 + -1r = -9

Add '21' to each side of the equation.
-21 + 21 + -1r = -9 + 21

Combine like terms: -21 + 21 = 0
0 + -1r = -9 + 21
-1r = -9 + 21

Combine like terms: -9 + 21 = 12
-1r = 12

Divide each side by '-1'.
r = -12

Simplifying
r = -12

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