Instead of "a half", write "eight sixteenths". That doesn't change the value of
any numbers, but it makes it a lot easier to subtract the three sixteenths from
the eight sixteenths.
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85
N = 28 (you have to subtract 70 from both sides of the equation)
70
140 / 2 = 70 Answer $70
70 = 81-n subtract 70 from both sides 0 = 11 - n subtract 11 from both sides -11 = -n divide both sides by -1 11 = n