-7+5r-12=20-8r

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Solution for -7+5r-12=20-8r equation:


Simplifying
-7 + 5r + -12 = 20 + -8r

Reorder the terms:
-7 + -12 + 5r = 20 + -8r

Combine like terms: -7 + -12 = -19
-19 + 5r = 20 + -8r

Solving
-19 + 5r = 20 + -8r

Solving for variable 'r'.

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

Add '8r' to each side of the equation.
-19 + 5r + 8r = 20 + -8r + 8r

Combine like terms: 5r + 8r = 13r
-19 + 13r = 20 + -8r + 8r

Combine like terms: -8r + 8r = 0
-19 + 13r = 20 + 0
-19 + 13r = 20

Add '19' to each side of the equation.
-19 + 19 + 13r = 20 + 19

Combine like terms: -19 + 19 = 0
0 + 13r = 20 + 19
13r = 20 + 19

Combine like terms: 20 + 19 = 39
13r = 39

Divide each side by '13'.
r = 3

Simplifying
r = 3

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