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-3(1+5n)-7(1-8n)=72
We simplify the equation to the form, which is simple to understand
-3(1+5n)-7(1-8n)=72
Reorder the terms in parentheses
+(-3-15n)-7*(1-8n)=72
Remove unnecessary parentheses
-3-15n-7+*(+1-8n+)=+72
Reorder the terms in parentheses
-3-15n+(-7+56n)=72
Remove unnecessary parentheses
-3-15n-7+56n=+72
We move all terms containing n to the left and all other terms to the right.
-15n+56n=+72+3+7
We simplify left and right side of the equation.
+41n=+82
We divide both sides of the equation by 41 to get n.
n=2
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