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12+6r=2r+36
We simplify the equation to the form, which is simple to understand
12+6r=2r+36
We move all terms containing r to the left and all other terms to the right.
+6r-2r=+36-12
We simplify left and right side of the equation.
+4r=+24
We divide both sides of the equation by 4 to get r.
r=6
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