-4(2-r)=20

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Solution for -4(2-r)=20 equation: 


Simplifying
-4(2 + -1r) = 20
(2 * -4 + -1r * -4) = 20
(-8 + 4r) = 20

Solving
-8 + 4r = 20

Solving for variable 'r'.

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

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

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

Combine like terms: 20 + 8 = 28
4r = 28

Divide each side by '4'.
r = 7

Simplifying
r = 7

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