-216=8(1-7r)

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


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

Solving
-216 = 8 + -56r

Solving for variable 'r'.

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

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

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

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

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

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

Divide each side by '56'.
r = 4

Simplifying
r = 4

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