-8r-9=39+4r

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Solution for -8r-9=39+4r equation:


Simplifying
-8r + -9 = 39 + 4r

Reorder the terms:
-9 + -8r = 39 + 4r

Solving
-9 + -8r = 39 + 4r

Solving for variable 'r'.

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

Add '-4r' to each side of the equation.
-9 + -8r + -4r = 39 + 4r + -4r

Combine like terms: -8r + -4r = -12r
-9 + -12r = 39 + 4r + -4r

Combine like terms: 4r + -4r = 0
-9 + -12r = 39 + 0
-9 + -12r = 39

Add '9' to each side of the equation.
-9 + 9 + -12r = 39 + 9

Combine like terms: -9 + 9 = 0
0 + -12r = 39 + 9
-12r = 39 + 9

Combine like terms: 39 + 9 = 48
-12r = 48

Divide each side by '-12'.
r = -4

Simplifying
r = -4

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