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66+4n+1=57
We simplify the equation to the form, which is simple to understand
66+4n+1=57
We move all terms containing n to the left and all other terms to the right.
+4n=+57-66-1
We simplify left and right side of the equation.
+4n=-10
We divide both sides of the equation by 4 to get n.
n=-2.5
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