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4(r+20)+4r=250
We simplify the equation to the form, which is simple to understand
4(r+20)+4r=250
Reorder the terms in parentheses
+(+4r+80)+4r=250
Remove unnecessary parentheses
+4r+80+4r=+250
We move all terms containing r to the left and all other terms to the right.
+4r+4r=+250-80
We simplify left and right side of the equation.
+8r=+170
We divide both sides of the equation by 8 to get r.
r=21.25
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