-15=9r+-7r

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Solution for -15=9r+-7r equation:


Simplifying
-15 = 9r + -7r

Combine like terms: 9r + -7r = 2r
-15 = 2r

Solving
-15 = 2r

Solving for variable 'r'.

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

Add '-2r' to each side of the equation.
-15 + -2r = 2r + -2r

Combine like terms: 2r + -2r = 0
-15 + -2r = 0

Add '15' to each side of the equation.
-15 + 15 + -2r = 0 + 15

Combine like terms: -15 + 15 = 0
0 + -2r = 0 + 15
-2r = 0 + 15

Combine like terms: 0 + 15 = 15
-2r = 15

Divide each side by '-2'.
r = -7.5

Simplifying
r = -7.5

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