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-21=-5(1-4n)+4(6n+7)
We simplify the equation to the form, which is simple to understand
-21=-5(1-4n)+4(6n+7)
Reorder the terms in parentheses
-21=+(-5+20n)+4*(6n+7)
Remove unnecessary parentheses
-21=-5+20n+4+*(+6n+7+)
Reorder the terms in parentheses
-21=-5+20n+(+24n+28)
Remove unnecessary parentheses
-21=-5+20n+24n+28
We move all terms containing n to the left and all other terms to the right.
-20n-24n=-5+28+21
We simplify left and right side of the equation.
-44n=+44
We divide both sides of the equation by -44 to get n.
n=-1
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