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4r+8r=-4(-8+r)-5(4r-8)
We simplify the equation to the form, which is simple to understand
4r+8r=-4(-8+r)-5(4r-8)
Reorder the terms in parentheses
4r+8r=+(+32-4r)-5*(4r-8)
Remove unnecessary parentheses
+4r+8r=+32-4r-5+*(+4r-8+)
Reorder the terms in parentheses
4r+8r=+32-4r+(-20r+40)
Remove unnecessary parentheses
+4r+8r=+32-4r-20r+40
We move all terms containing r to the left and all other terms to the right.
+4r+8r+4r+20r=+32+40
We simplify left and right side of the equation.
+36r=+72
We divide both sides of the equation by 36 to get r.
r=2
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