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2(4r+8)-4(r+3)=0
We simplify the equation to the form, which is simple to understand
2(4r+8)-4(r+3)=0
Reorder the terms in parentheses
+(+8r+16)-4*(r+3)=0
Remove unnecessary parentheses
+8r+16-4+*(+r+3+)=0
Reorder the terms in parentheses
+8r+16+(-4r-12)=0
Remove unnecessary parentheses
+8r+16-4r-12=0
We move all terms containing r to the left and all other terms to the right.
+8r-4r=0-16+12
We simplify left and right side of the equation.
+4r=-4
We divide both sides of the equation by 4 to get r.
r=-1
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