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-16-20n+1=-155
We simplify the equation to the form, which is simple to understand
-16-20n+1=-155
We move all terms containing n to the left and all other terms to the right.
-20n=-155+16-1
We simplify left and right side of the equation.
-20n=-140
We divide both sides of the equation by -20 to get n.
n=7
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