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-3(n+7)-(-9n-3)=5n
We simplify the equation to the form, which is simple to understand
-3(n+7)-(-9n-3)=5n
Reorder the terms in parentheses
+(-3n-21)-(-9n-3)=5n
Remove unnecessary parentheses
-3n-21-(-9n-3+)=+5n
Remove unnecessary parentheses
-3n-21+9n+3=5n
We move all terms containing n to the left and all other terms to the right.
-3n+9n-5n=+21-3
We simplify left and right side of the equation.
+1n=+18
We divide both sides of the equation by 1 to get n.
n=18
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