8r+r=5r-12

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


Simplifying
8r + r = 5r + -12

Combine like terms: 8r + r = 9r
9r = 5r + -12

Reorder the terms:
9r = -12 + 5r

Solving
9r = -12 + 5r

Solving for variable 'r'.

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

Add '-5r' to each side of the equation.
9r + -5r = -12 + 5r + -5r

Combine like terms: 9r + -5r = 4r
4r = -12 + 5r + -5r

Combine like terms: 5r + -5r = 0
4r = -12 + 0
4r = -12

Divide each side by '4'.
r = -3

Simplifying
r = -3

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