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-28+4r=4(r-5)+8r
We simplify the equation to the form, which is simple to understand
-28+4r=4(r-5)+8r
Reorder the terms in parentheses
-28+4r=+(+4r-20)+8r
Remove unnecessary parentheses
-28+4r=+4r-20+8r
We move all terms containing r to the left and all other terms to the right.
+4r-4r-8r=-20+28
We simplify left and right side of the equation.
-8r=+8
We divide both sides of the equation by -8 to get r.
r=-1
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