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3r+7-r=1
We simplify the equation to the form, which is simple to understand
3r+7-r=1
We move all terms containing r to the left and all other terms to the right.
+3r-1r=+1-7
We simplify left and right side of the equation.
+2r=-6
We divide both sides of the equation by 2 to get r.
r=-3
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