3(1+7r)=87

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Solution for 3(1+7r)=87 equation: 


Simplifying
3(1 + 7r) = 87
(1 * 3 + 7r * 3) = 87
(3 + 21r) = 87

Solving
3 + 21r = 87

Solving for variable 'r'.

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

Add '-3' to each side of the equation.
3 + -3 + 21r = 87 + -3

Combine like terms: 3 + -3 = 0
0 + 21r = 87 + -3
21r = 87 + -3

Combine like terms: 87 + -3 = 84
21r = 84

Divide each side by '21'.
r = 4

Simplifying
r = 4

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