20=8+4*r

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Solution for 20=8+4*r equation:


Simplifying
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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