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-3(1-6r)=105
We simplify the equation to the form, which is simple to understand
-3(1-6r)=105
Reorder the terms in parentheses
+(-3+18r)=105
Remove unnecessary parentheses
-3+18r=+105
We move all terms containing r to the left and all other terms to the right.
+18r=+105+3
We simplify left and right side of the equation.
+18r=+108
We divide both sides of the equation by 18 to get r.
r=6
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