10(4+r)=80

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Solution for 10(4+r)=80 equation: 


Simplifying
10(4 + r) = 80
(4 * 10 + r * 10) = 80
(40 + 10r) = 80

Solving
40 + 10r = 80

Solving for variable 'r'.

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

Add '-40' to each side of the equation.
40 + -40 + 10r = 80 + -40

Combine like terms: 40 + -40 = 0
0 + 10r = 80 + -40
10r = 80 + -40

Combine like terms: 80 + -40 = 40
10r = 40

Divide each side by '10'.
r = 4

Simplifying
r = 4

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