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3r-9=7+2r-r
We simplify the equation to the form, which is simple to understand
3r-9=7+2r-r
We move all terms containing r to the left and all other terms to the right.
+3r-2r+1r=+7+9
We simplify left and right side of the equation.
+2r=+16
We divide both sides of the equation by 2 to get r.
r=8
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