-20=r-8+3r

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Solution for -20=r-8+3r equation:


Simplifying
-20 = r + -8 + 3r

Reorder the terms:
-20 = -8 + r + 3r

Combine like terms: r + 3r = 4r
-20 = -8 + 4r

Solving
-20 = -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.
-20 + -4r = -8 + 4r + -4r

Combine like terms: 4r + -4r = 0
-20 + -4r = -8 + 0
-20 + -4r = -8

Add '20' to each side of the equation.
-20 + 20 + -4r = -8 + 20

Combine like terms: -20 + 20 = 0
0 + -4r = -8 + 20
-4r = -8 + 20

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

Divide each side by '-4'.
r = -3

Simplifying
r = -3

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