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-3=3(r-10)
We simplify the equation to the form, which is simple to understand
-3=3(r-10)
Reorder the terms in parentheses
-3=+(+3r-30)
Remove unnecessary parentheses
-3=+3r-30
We move all terms containing r to the left and all other terms to the right.
-3r=-30+3
We simplify left and right side of the equation.
-3r=-27
We divide both sides of the equation by -03 to get r.
r=9
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