-2r+7r=12-7

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Solution for -2r+7r=12-7 equation: 


Simplifying
-2r + 7r = 12 + -7

Combine like terms: -2r + 7r = 5r
5r = 12 + -7

Combine like terms: 12 + -7 = 5
5r = 5

Solving
5r = 5

Solving for variable 'r'.

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

Divide each side by '5'.
r = 1

Simplifying
r = 1

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