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2r+4r-3=9
We simplify the equation to the form, which is simple to understand
2r+4r-3=9
We move all terms containing r to the left and all other terms to the right.
+2r+4r=+9+3
We simplify left and right side of the equation.
+6r=+12
We divide both sides of the equation by 6 to get r.
r=2
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