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

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


Simplifying
-15 + -1r + 8r = 3r + 5

Combine like terms: -1r + 8r = 7r
-15 + 7r = 3r + 5

Reorder the terms:
-15 + 7r = 5 + 3r

Solving
-15 + 7r = 5 + 3r

Solving for variable 'r'.

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

Add '-3r' to each side of the equation.
-15 + 7r + -3r = 5 + 3r + -3r

Combine like terms: 7r + -3r = 4r
-15 + 4r = 5 + 3r + -3r

Combine like terms: 3r + -3r = 0
-15 + 4r = 5 + 0
-15 + 4r = 5

Add '15' to each side of the equation.
-15 + 15 + 4r = 5 + 15

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

Combine like terms: 5 + 15 = 20
4r = 20

Divide each side by '4'.
r = 5

Simplifying
r = 5

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