5(10+r)=90

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Solution for 5(10+r)=90 equation: 


Simplifying
5(10 + r) = 90
(10 * 5 + r * 5) = 90
(50 + 5r) = 90

Solving
50 + 5r = 90

Solving for variable 'r'.

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

Add '-50' to each side of the equation.
50 + -50 + 5r = 90 + -50

Combine like terms: 50 + -50 = 0
0 + 5r = 90 + -50
5r = 90 + -50

Combine like terms: 90 + -50 = 40
5r = 40

Divide each side by '5'.
r = 8

Simplifying
r = 8

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