2r=4(r-20)

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


2r=4(r-20)

We simplify the equation to the form, which is simple to understand 
2r=4(r-20)

Reorder the terms in parentheses
2r=+(+4r-80)

Remove unnecessary parentheses
+2r=+4r-80

We move all terms containing r to the left and all other terms to the right. 
+2r-4r=-80

We simplify left and right side of the equation. 
-2r=-80

We divide both sides of the equation by -2 to get r. 
r=40

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