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6(r-5)-3r-(4-r)=0
We simplify the equation to the form, which is simple to understand
6(r-5)-3r-(4-r)=0
Reorder the terms in parentheses
+(+6r-30)-3r-(4-r)=0
Remove unnecessary parentheses
+6r-30-3r-(+4-r+)=0
Remove unnecessary parentheses
+6r-30-3r-4+1r=0
We move all terms containing r to the left and all other terms to the right.
+6r-3r+1r=0+30+4
We simplify left and right side of the equation.
+4r=+34
We divide both sides of the equation by 4 to get r.
r=8.5
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