(5r)(-2)=80

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Solution for (5r)(-2)=80 equation: 


Simplifying
(5r)(-2) = 80

Remove parenthesis around (5r)
5r(-2) = 80

Reorder the terms for easier multiplication:
5 * -2r = 80

Multiply 5 * -2
-10r = 80

Solving
-10r = 80

Solving for variable 'r'.

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

Divide each side by '-10'.
r = -8

Simplifying
r = -8

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