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-87=1+4(-4-3r)
We simplify the equation to the form, which is simple to understand
-87=1+4(-4-3r)
Reorder the terms in parentheses
-87=1+(-16-12r)
Remove unnecessary parentheses
-87=+1-16-12r
We move all terms containing r to the left and all other terms to the right.
+12r=+1-16+87
We simplify left and right side of the equation.
+12r=+72
We divide both sides of the equation by 012 to get r.
r=6
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