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3(r+2)+2(r-4)-18=0
We simplify the equation to the form, which is simple to understand
3(r+2)+2(r-4)-18=0
Reorder the terms in parentheses
+(+3r+6)+2*(r-4)-18=0
Remove unnecessary parentheses
+3r+6+2+*(+r-4+)-18=0
Reorder the terms in parentheses
+3r+6+(+2r-8)-18=0
Remove unnecessary parentheses
+3r+6+2r-8-18=0
We move all terms containing r to the left and all other terms to the right.
+3r+2r=0-6+8+18
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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