-8(-1-7r)=-216

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Solution for -8(-1-7r)=-216 equation: 


Simplifying
-8(-1 + -7r) = -216
(-1 * -8 + -7r * -8) = -216
(8 + 56r) = -216

Solving
8 + 56r = -216

Solving for variable 'r'.

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

Add '-8' to each side of the equation.
8 + -8 + 56r = -216 + -8

Combine like terms: 8 + -8 = 0
0 + 56r = -216 + -8
56r = -216 + -8

Combine like terms: -216 + -8 = -224
56r = -224

Divide each side by '56'.
r = -4

Simplifying
r = -4

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