4(15-5r)=90

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Solution for 4(15-5r)=90 equation: 


Simplifying
4(15 + -5r) = 90
(15 * 4 + -5r * 4) = 90
(60 + -20r) = 90

Solving
60 + -20r = 90

Solving for variable 'r'.

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

Add '-60' to each side of the equation.
60 + -60 + -20r = 90 + -60

Combine like terms: 60 + -60 = 0
0 + -20r = 90 + -60
-20r = 90 + -60

Combine like terms: 90 + -60 = 30
-20r = 30

Divide each side by '-20'.
r = -1.5

Simplifying
r = -1.5

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