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5(4+r)=1\2(40+10r)
We simplify the equation to the form, which is simple to understand
5(4+r)=1\2(40+10r)
Reorder the terms in parentheses
+(+20+5r)=1\2*(40+10r)
Remove unnecessary parentheses
+20+5r=+1\2+*(+40+10r+)
Reorder the terms in parentheses
+20+5r=+(+40+10r)
Remove unnecessary parentheses
+20+5r=+40+10r
We move all terms containing r to the left and all other terms to the right.
+5r-10r=+40-20
We simplify left and right side of the equation.
-5r=+20
We divide both sides of the equation by -5 to get r.
r=-4
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