Answer : 130
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10 plus 20-2 - 11 plus 3 is equal to 20.
11 plus 5-10 plus 20-9 plus 14-10 is equal to 21
8 minus negative three or 8--3 equal positive 11. The double negative converts the minus sign into a plus sign and the negative into a positive.
Eleven fifteenths minus ten fifteenths is equal to one fifteenth.
In the equation 5n-11=4n+20, n is equal to 31.