3(r+7)=

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Solution for 3(r+7)= equation: 


Simplifying
3(r + 7) = 0

Reorder the terms:
3(7 + r) = 0
(7 * 3 + r * 3) = 0
(21 + 3r) = 0

Solving
21 + 3r = 0

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 + 3r = 0 + -21

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

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

Divide each side by '3'.
r = -7

Simplifying
r = -7

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