-2(r-20)=-4r

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


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

Reorder the terms:
-2(-20 + r) = -4r
(-20 * -2 + r * -2) = -4r
(40 + -2r) = -4r

Solving
40 + -2r = -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.
40 + -2r + 4r = -4r + 4r

Combine like terms: -2r + 4r = 2r
40 + 2r = -4r + 4r

Combine like terms: -4r + 4r = 0
40 + 2r = 0

Add '-40' to each side of the equation.
40 + -40 + 2r = 0 + -40

Combine like terms: 40 + -40 = 0
0 + 2r = 0 + -40
2r = 0 + -40

Combine like terms: 0 + -40 = -40
2r = -40

Divide each side by '2'.
r = -20

Simplifying
r = -20

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