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4r+12=-2(r+3)
We simplify the equation to the form, which is simple to understand
4r+12=-2(r+3)
Reorder the terms in parentheses
4r+12=+(-2r-6)
Remove unnecessary parentheses
+4r+12=-2r-6
We move all terms containing r to the left and all other terms to the right.
+4r+2r=-6-12
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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