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`420+(-15)=n`

We simplify the equation to the form, which is simple to understand

420+(-15)=n

Remove unnecessary parentheses

+420-15=+n

We move all terms containing n to the left and all other terms to the right.

-1n=-420+15

We simplify left and right side of the equation.

-1n=-405

We divide both sides of the equation by -01 to get n.

n=405

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