8r+r=-15+4r

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Solution for 8r+r=-15+4r equation: 


Simplifying
8r + r = -15 + 4r

Combine like terms: 8r + r = 9r
9r = -15 + 4r

Solving
9r = -15 + 4r

Solving for variable 'r'.

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

Add '-4r' to each side of the equation.
9r + -4r = -15 + 4r + -4r

Combine like terms: 9r + -4r = 5r
5r = -15 + 4r + -4r

Combine like terms: 4r + -4r = 0
5r = -15 + 0
5r = -15

Divide each side by '5'.
r = -3

Simplifying
r = -3

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