86=-1-3(-1+4r)

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Solution for 86=-1-3(-1+4r) equation:


Simplifying
86 = -1 + -3(-1 + 4r)
86 = -1 + (-1 * -3 + 4r * -3)
86 = -1 + (3 + -12r)

Combine like terms: -1 + 3 = 2
86 = 2 + -12r

Solving
86 = 2 + -12r

Solving for variable 'r'.

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

Add '12r' to each side of the equation.
86 + 12r = 2 + -12r + 12r

Combine like terms: -12r + 12r = 0
86 + 12r = 2 + 0
86 + 12r = 2

Add '-86' to each side of the equation.
86 + -86 + 12r = 2 + -86

Combine like terms: 86 + -86 = 0
0 + 12r = 2 + -86
12r = 2 + -86

Combine like terms: 2 + -86 = -84
12r = -84

Divide each side by '12'.
r = -7

Simplifying
r = -7

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