-5r-2r=-15-8r+3+7

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Solution for -5r-2r=-15-8r+3+7 equation:


Simplifying
-5r + -2r = -15 + -8r + 3 + 7

Combine like terms: -5r + -2r = -7r
-7r = -15 + -8r + 3 + 7

Reorder the terms:
-7r = -15 + 3 + 7 + -8r

Combine like terms: -15 + 3 = -12
-7r = -12 + 7 + -8r

Combine like terms: -12 + 7 = -5
-7r = -5 + -8r

Solving
-7r = -5 + -8r

Solving for variable 'r'.

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

Add '8r' to each side of the equation.
-7r + 8r = -5 + -8r + 8r

Combine like terms: -7r + 8r = 1r
1r = -5 + -8r + 8r

Combine like terms: -8r + 8r = 0
1r = -5 + 0
1r = -5

Divide each side by '1'.
r = -5

Simplifying
r = -5

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