3r-7r=8

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Solution for 3r-7r=8 equation: 


Simplifying
3r + -7r = 8

Combine like terms: 3r + -7r = -4r
-4r = 8

Solving
-4r = 8

Solving for variable 'r'.

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

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

Simplifying
r = -2

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