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-2(3n+6)-(4n-3)=21
We simplify the equation to the form, which is simple to understand
-2(3n+6)-(4n-3)=21
Reorder the terms in parentheses
+(-6n-12)-(4n-3)=21
Remove unnecessary parentheses
-6n-12-(+4n-3+)=+21
Remove unnecessary parentheses
-6n-12-4n+3=21
We move all terms containing n to the left and all other terms to the right.
-6n-4n=+21+12-3
We simplify left and right side of the equation.
-10n=+30
We divide both sides of the equation by -10 to get n.
n=-3
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