8r-r=-21

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Solution for 8r-r=-21 equation: 


Simplifying
8r + -1r = -21

Combine like terms: 8r + -1r = 7r
7r = -21

Solving
7r = -21

Solving for variable 'r'.

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

Divide each side by '7'.
r = -3

Simplifying
r = -3

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