-2(2-r)+4r=20

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


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

Combine like terms: 2r + 4r = 6r
-4 + 6r = 20

Solving
-4 + 6r = 20

Solving for variable 'r'.

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

Add '4' to each side of the equation.
-4 + 4 + 6r = 20 + 4

Combine like terms: -4 + 4 = 0
0 + 6r = 20 + 4
6r = 20 + 4

Combine like terms: 20 + 4 = 24
6r = 24

Divide each side by '6'.
r = 4

Simplifying
r = 4

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