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4+(n-1)2=72
We simplify the equation to the form, which is simple to understand
4+(n-1)2=72
Reorder the terms in parentheses
4+(+2n-2)=72
Remove unnecessary parentheses
+4+2n-2=+72
We move all terms containing n to the left and all other terms to the right.
+2n=+72-4+2
We simplify left and right side of the equation.
+2n=+70
We divide both sides of the equation by 2 to get n.
n=35
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