8r-5r=-12+r

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Solution for 8r-5r=-12+r equation: 


Simplifying
8r + -5r = -12 + r

Combine like terms: 8r + -5r = 3r
3r = -12 + r

Solving
3r = -12 + r

Solving for variable 'r'.

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

Add '-1r' to each side of the equation.
3r + -1r = -12 + r + -1r

Combine like terms: 3r + -1r = 2r
2r = -12 + r + -1r

Combine like terms: r + -1r = 0
2r = -12 + 0
2r = -12

Divide each side by '2'.
r = -6

Simplifying
r = -6

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