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r+7=-3+3r
We simplify the equation to the form, which is simple to understand
r+7=-3+3r
We move all terms containing r to the left and all other terms to the right.
+1r-3r=-3-7
We simplify left and right side of the equation.
-2r=-10
We divide both sides of the equation by -2 to get r.
r=5
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