3(-7+3r)=-84

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


Simplifying
3(-7 + 3r) = -84
(-7 * 3 + 3r * 3) = -84
(-21 + 9r) = -84

Solving
-21 + 9r = -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 + 9r = -84 + 21

Combine like terms: -21 + 21 = 0
0 + 9r = -84 + 21
9r = -84 + 21

Combine like terms: -84 + 21 = -63
9r = -63

Divide each side by '9'.
r = -7

Simplifying
r = -7

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