4(2r+5)=84

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Solution for 4(2r+5)=84 equation: 


Simplifying
4(2r + 5) = 84

Reorder the terms:
4(5 + 2r) = 84
(5 * 4 + 2r * 4) = 84
(20 + 8r) = 84

Solving
20 + 8r = 84

Solving for variable 'r'.

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

Add '-20' to each side of the equation.
20 + -20 + 8r = 84 + -20

Combine like terms: 20 + -20 = 0
0 + 8r = 84 + -20
8r = 84 + -20

Combine like terms: 84 + -20 = 64
8r = 64

Divide each side by '8'.
r = 8

Simplifying
r = 8

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