6+3(-7+4r)=-87

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Solution for 6+3(-7+4r)=-87 equation: 


Simplifying
6 + 3(-7 + 4r) = -87
6 + (-7 * 3 + 4r * 3) = -87
6 + (-21 + 12r) = -87

Combine like terms: 6 + -21 = -15
-15 + 12r = -87

Solving
-15 + 12r = -87

Solving for variable 'r'.

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

Add '15' to each side of the equation.
-15 + 15 + 12r = -87 + 15

Combine like terms: -15 + 15 = 0
0 + 12r = -87 + 15
12r = -87 + 15

Combine like terms: -87 + 15 = -72
12r = -72

Divide each side by '12'.
r = -6

Simplifying
r = -6

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