-80=8(r-1)

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Solution for -80=8(r-1) equation:


Simplifying
-80 = 8(r + -1)

Reorder the terms:
-80 = 8(-1 + r)
-80 = (-1 * 8 + r * 8)
-80 = (-8 + 8r)

Solving
-80 = -8 + 8r

Solving for variable 'r'.

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

Add '-8r' to each side of the equation.
-80 + -8r = -8 + 8r + -8r

Combine like terms: 8r + -8r = 0
-80 + -8r = -8 + 0
-80 + -8r = -8

Add '80' to each side of the equation.
-80 + 80 + -8r = -8 + 80

Combine like terms: -80 + 80 = 0
0 + -8r = -8 + 80
-8r = -8 + 80

Combine like terms: -8 + 80 = 72
-8r = 72

Divide each side by '-8'.
r = -9

Simplifying
r = -9

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