12=4r-8

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Solution for 12=4r-8 equation:


Simplifying
12 = 4r + -8

Reorder the terms:
12 = -8 + 4r

Solving
12 = -8 + 4r

Solving for variable 'r'.

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

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

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

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

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

Combine like terms: -8 + -12 = -20
-4r = -20

Divide each side by '-4'.
r = 5

Simplifying
r = 5

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