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Anonymous
15b+2-13 = 13b+6-4b
15b-11 = 9b+6
15b-9b = 6+11
6b = 17
b =17/6 or 2 and 5/6
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15b/39b4 = 5/13*b-3
yes it is
basically you asked what -28+21 which equals -7
X +13 equals 22, X equals nine
13 13+16=29