12=1-8r-5

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Solution for 12=1-8r-5 equation:


Simplifying
12 = 1 + -8r + -5

Reorder the terms:
12 = 1 + -5 + -8r

Combine like terms: 1 + -5 = -4
12 = -4 + -8r

Solving
12 = -4 + -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.
12 + 8r = -4 + -8r + 8r

Combine like terms: -8r + 8r = 0
12 + 8r = -4 + 0
12 + 8r = -4

Add '-12' to each side of the equation.
12 + -12 + 8r = -4 + -12

Combine like terms: 12 + -12 = 0
0 + 8r = -4 + -12
8r = -4 + -12

Combine like terms: -4 + -12 = -16
8r = -16

Divide each side by '8'.
r = -2

Simplifying
r = -2

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