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40=-8(7-5n)-8(2-2n)
We simplify the equation to the form, which is simple to understand
40=-8(7-5n)-8(2-2n)
Reorder the terms in parentheses
40=+(-56+40n)-8*(2-2n)
Remove unnecessary parentheses
+40=-56+40n-8+*(+2-2n+)
Reorder the terms in parentheses
40=-56+40n+(-16+16n)
Remove unnecessary parentheses
+40=-56+40n-16+16n
We move all terms containing n to the left and all other terms to the right.
-40n-16n=-56-16-40
We simplify left and right side of the equation.
-56n=-112
We divide both sides of the equation by -56 to get n.
n=2
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