8r+5r-r=36

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Solution for 8r+5r-r=36 equation: 


Simplifying
8r + 5r + -1r = 36

Combine like terms: 8r + 5r = 13r
13r + -1r = 36

Combine like terms: 13r + -1r = 12r
12r = 36

Solving
12r = 36

Solving for variable 'r'.

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

Divide each side by '12'.
r = 3

Simplifying
r = 3

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