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223=-2+5(3-7r)
We simplify the equation to the form, which is simple to understand
223=-2+5(3-7r)
Reorder the terms in parentheses
223=-2+(+15-35r)
Remove unnecessary parentheses
+223=-2+15-35r
We move all terms containing r to the left and all other terms to the right.
+35r=-2+15-223
We simplify left and right side of the equation.
+35r=-210
We divide both sides of the equation by 035 to get r.
r=-6
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