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83=-5(-3r-1)+3
We simplify the equation to the form, which is simple to understand
83=-5(-3r-1)+3
Reorder the terms in parentheses
83=+(+15r+5)+3
Remove unnecessary parentheses
+83=+15r+5+3
We move all terms containing r to the left and all other terms to the right.
-15r=+5+3-83
We simplify left and right side of the equation.
-15r=-75
We divide both sides of the equation by -015 to get r.
r=5
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