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-15=3(r-90)
We simplify the equation to the form, which is simple to understand
-15=3(r-90)
Reorder the terms in parentheses
-15=+(+3r-270)
Remove unnecessary parentheses
-15=+3r-270
We move all terms containing r to the left and all other terms to the right.
-3r=-270+15
We simplify left and right side of the equation.
-3r=-255
We divide both sides of the equation by -03 to get r.
r=85
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