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-33=12+3r
We simplify the equation to the form, which is simple to understand
-33=12+3r
We move all terms containing r to the left and all other terms to the right.
-3r=+12+33
We simplify left and right side of the equation.
-3r=+45
We divide both sides of the equation by -03 to get r.
r=-15
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