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-15n+(-25)=20
We simplify the equation to the form, which is simple to understand
-15n+(-25)=20
Remove unnecessary parentheses
-15n-25=+20
We move all terms containing n to the left and all other terms to the right.
-15n=+20+25
We simplify left and right side of the equation.
-15n=+45
We divide both sides of the equation by -15 to get n.
n=-3
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