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4(1+3r)=-104
We simplify the equation to the form, which is simple to understand
4(1+3r)=-104
Reorder the terms in parentheses
+(+4+12r)=-104
Remove unnecessary parentheses
+4+12r=-104
We move all terms containing r to the left and all other terms to the right.
+12r=-104-4
We simplify left and right side of the equation.
+12r=-108
We divide both sides of the equation by 12 to get r.
r=-9
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