-2r-15=8r-7r

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Solution for -2r-15=8r-7r equation:


Simplifying
-2r + -15 = 8r + -7r

Reorder the terms:
-15 + -2r = 8r + -7r

Combine like terms: 8r + -7r = 1r
-15 + -2r = 1r

Solving
-15 + -2r = 1r

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.
-15 + -2r + -1r = 1r + -1r

Combine like terms: -2r + -1r = -3r
-15 + -3r = 1r + -1r

Combine like terms: 1r + -1r = 0
-15 + -3r = 0

Add '15' to each side of the equation.
-15 + 15 + -3r = 0 + 15

Combine like terms: -15 + 15 = 0
0 + -3r = 0 + 15
-3r = 0 + 15

Combine like terms: 0 + 15 = 15
-3r = 15

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

Simplifying
r = -5

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