7(3+3r)=84

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Solution for 7(3+3r)=84 equation: 


Simplifying
7(3 + 3r) = 84
(3 * 7 + 3r * 7) = 84
(21 + 21r) = 84

Solving
21 + 21r = 84

Solving for variable 'r'.

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

Add '-21' to each side of the equation.
21 + -21 + 21r = 84 + -21

Combine like terms: 21 + -21 = 0
0 + 21r = 84 + -21
21r = 84 + -21

Combine like terms: 84 + -21 = 63
21r = 63

Divide each side by '21'.
r = 3

Simplifying
r = 3

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