20=-5r-8r

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Solution for 20=-5r-8r equation:


Simplifying
20 = -5r + -8r

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

Solving
20 = -13r

Solving for variable 'r'.

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

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

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

Add '-20' to each side of the equation.
20 + -20 + 13r = 0 + -20

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

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

Divide each side by '13'.
r = -1.538461538

Simplifying
r = -1.538461538

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