r-3r=-8

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Solution for r-3r=-8 equation: 


Simplifying
r + -3r = -8

Combine like terms: r + -3r = -2r
-2r = -8

Solving
-2r = -8

Solving for variable 'r'.

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

Divide each side by '-2'.
r = 4

Simplifying
r = 4

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