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-6r-4+7=-30
We simplify the equation to the form, which is simple to understand
-6r-4+7=-30
We move all terms containing r to the left and all other terms to the right.
-6r=-30+4-7
We simplify left and right side of the equation.
-6r=-33
We divide both sides of the equation by -6 to get r.
r=5.5
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