5-8-2r-5=-15

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Solution for 5-8-2r-5=-15 equation: 


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

Reorder the terms:
5 + -8 + -5 + -2r = -15

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

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

Solving
-8 + -2r = -15

Solving for variable 'r'.

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

Add '8' to each side of the equation.
-8 + 8 + -2r = -15 + 8

Combine like terms: -8 + 8 = 0
0 + -2r = -15 + 8
-2r = -15 + 8

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

Divide each side by '-2'.
r = 3.5

Simplifying
r = 3.5

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