3r+2s-9r-8+7s-12+r=

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Solution for 3r+2s-9r-8+7s-12+r= equation:


Simplifying
3r + 2s + -9r + -8 + 7s + -12 + r = 0

Reorder the terms:
-8 + -12 + 3r + -9r + r + 2s + 7s = 0

Combine like terms: -8 + -12 = -20
-20 + 3r + -9r + r + 2s + 7s = 0

Combine like terms: 3r + -9r = -6r
-20 + -6r + r + 2s + 7s = 0

Combine like terms: -6r + r = -5r
-20 + -5r + 2s + 7s = 0

Combine like terms: 2s + 7s = 9s
-20 + -5r + 9s = 0

Solving
-20 + -5r + 9s = 0

Solving for variable 'r'.

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

Add '20' to each side of the equation.
-20 + -5r + 20 + 9s = 0 + 20

Reorder the terms:
-20 + 20 + -5r + 9s = 0 + 20

Combine like terms: -20 + 20 = 0
0 + -5r + 9s = 0 + 20
-5r + 9s = 0 + 20

Combine like terms: 0 + 20 = 20
-5r + 9s = 20

Add '-9s' to each side of the equation.
-5r + 9s + -9s = 20 + -9s

Combine like terms: 9s + -9s = 0
-5r + 0 = 20 + -9s
-5r = 20 + -9s

Divide each side by '-5'.
r = -4 + 1.8s

Simplifying
r = -4 + 1.8s

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