-6r-9+7r=-21

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Solution for -6r-9+7r=-21 equation:


Simplifying
-6r + -9 + 7r = -21

Reorder the terms:
-9 + -6r + 7r = -21

Combine like terms: -6r + 7r = 1r
-9 + 1r = -21

Solving
-9 + 1r = -21

Solving for variable 'r'.

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

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

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

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

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

Simplifying
r = -12

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