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-12+3=8-2r
We simplify the equation to the form, which is simple to understand
-12+3=8-2r
We move all terms containing r to the left and all other terms to the right.
+2r=+8+12-3
We simplify left and right side of the equation.
+2r=+17
We divide both sides of the equation by 02 to get r.
r=8.5
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