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5r-2+r+4r+12=-20
We simplify the equation to the form, which is simple to understand
5r-2+r+4r+12=-20
We move all terms containing r to the left and all other terms to the right.
+5r+1r+4r=-20+2-12
We simplify left and right side of the equation.
+10r=-30
We divide both sides of the equation by 10 to get r.
r=-3
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