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2r+2+4r=-16
We simplify the equation to the form, which is simple to understand
2r+2+4r=-16
We move all terms containing r to the left and all other terms to the right.
+2r+4r=-16-2
We simplify left and right side of the equation.
+6r=-18
We divide both sides of the equation by 6 to get r.
r=-3
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