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-3(1+4r)-9=5(-12-12r)
We simplify the equation to the form, which is simple to understand
-3(1+4r)-9=5(-12-12r)
Reorder the terms in parentheses
+(-3-12r)-9=5*(-12-12r)
Remove unnecessary parentheses
-3-12r-9=+5+*(-12-12r+)
Reorder the terms in parentheses
-3-12r-9=+(-60-60r)
Remove unnecessary parentheses
-3-12r-9=-60-60r
We move all terms containing r to the left and all other terms to the right.
-12r+60r=-60+3+9
We simplify left and right side of the equation.
+48r=-48
We divide both sides of the equation by 48 to get r.
r=-1
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