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3r+12+2+4r-2=270
We simplify the equation to the form, which is simple to understand
3r+12+2+4r-2=270
We move all terms containing r to the left and all other terms to the right.
+3r+4r=+270-12-2+2
We simplify left and right side of the equation.
+7r=+258
We divide both sides of the equation by 7 to get r.
r=36.8571428571
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