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3(r-1)+2(r-1)=20
We simplify the equation to the form, which is simple to understand
3(r-1)+2(r-1)=20
Reorder the terms in parentheses
+(+3r-3)+2*(r-1)=20
Remove unnecessary parentheses
+3r-3+2+*(+r-1+)=+20
Reorder the terms in parentheses
+3r-3+(+2r-2)=20
Remove unnecessary parentheses
+3r-3+2r-2=+20
We move all terms containing r to the left and all other terms to the right.
+3r+2r=+20+3+2
We simplify left and right side of the equation.
+5r=+25
We divide both sides of the equation by 5 to get r.
r=5
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