-3r-5r=-21

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Solution for -3r-5r=-21 equation: 


Simplifying
-3r + -5r = -21

Combine like terms: -3r + -5r = -8r
-8r = -21

Solving
-8r = -21

Solving for variable 'r'.

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

Divide each side by '-8'.
r = 2.625

Simplifying
r = 2.625

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