-3r-9r=-20

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Solution for -3r-9r=-20 equation: 


Simplifying
-3r + -9r = -20

Combine like terms: -3r + -9r = -12r
-12r = -20

Solving
-12r = -20

Solving for variable 'r'.

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

Divide each side by '-12'.
r = 1.666666667

Simplifying
r = 1.666666667

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