9r+3r-12+2r-r=20

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Solution for 9r+3r-12+2r-r=20 equation: 


Simplifying
9r + 3r + -12 + 2r + -1r = 20

Reorder the terms:
-12 + 9r + 3r + 2r + -1r = 20

Combine like terms: 9r + 3r = 12r
-12 + 12r + 2r + -1r = 20

Combine like terms: 12r + 2r = 14r
-12 + 14r + -1r = 20

Combine like terms: 14r + -1r = 13r
-12 + 13r = 20

Solving
-12 + 13r = 20

Solving for variable 'r'.

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

Add '12' to each side of the equation.
-12 + 12 + 13r = 20 + 12

Combine like terms: -12 + 12 = 0
0 + 13r = 20 + 12
13r = 20 + 12

Combine like terms: 20 + 12 = 32
13r = 32

Divide each side by '13'.
r = 2.461538462

Simplifying
r = 2.461538462

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