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42+15r-2r=14r+42
We simplify the equation to the form, which is simple to understand
42+15r-2r=14r+42
We move all terms containing r to the left and all other terms to the right.
+15r-2r-14r=+42-42
We simplify left and right side of the equation.
-1r=0
We divide both sides of the equation by -1 to get r.
r=-0
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