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213=4(-3+7n)+1
We simplify the equation to the form, which is simple to understand
213=4(-3+7n)+1
Reorder the terms in parentheses
213=+(-12+28n)+1
Remove unnecessary parentheses
+213=-12+28n+1
We move all terms containing n to the left and all other terms to the right.
-28n=-12+1-213
We simplify left and right side of the equation.
-28n=-224
We divide both sides of the equation by -028 to get n.
n=8
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