-4(3-r)=20

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Solution for -4(3-r)=20 equation: 


Simplifying
-4(3 + -1r) = 20
(3 * -4 + -1r * -4) = 20
(-12 + 4r) = 20

Solving
-12 + 4r = 20

Solving for variable 'r'.

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

Add '12' to each side of the equation.
-12 + 12 + 4r = 20 + 12

Combine like terms: -12 + 12 = 0
0 + 4r = 20 + 12
4r = 20 + 12

Combine like terms: 20 + 12 = 32
4r = 32

Divide each side by '4'.
r = 8

Simplifying
r = 8

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