-12r+9=100-25r

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Solution for -12r+9=100-25r equation:


Simplifying
-12r + 9 = 100 + -25r

Reorder the terms:
9 + -12r = 100 + -25r

Solving
9 + -12r = 100 + -25r

Solving for variable 'r'.

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

Add '25r' to each side of the equation.
9 + -12r + 25r = 100 + -25r + 25r

Combine like terms: -12r + 25r = 13r
9 + 13r = 100 + -25r + 25r

Combine like terms: -25r + 25r = 0
9 + 13r = 100 + 0
9 + 13r = 100

Add '-9' to each side of the equation.
9 + -9 + 13r = 100 + -9

Combine like terms: 9 + -9 = 0
0 + 13r = 100 + -9
13r = 100 + -9

Combine like terms: 100 + -9 = 91
13r = 91

Divide each side by '13'.
r = 7

Simplifying
r = 7

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