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13+4n=91
We simplify the equation to the form, which is simple to understand
13+4n=91
We move all terms containing n to the left and all other terms to the right.
+4n=+91-13
We simplify left and right side of the equation.
+4n=+78
We divide both sides of the equation by 4 to get n.
n=19.5
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