You would have b-18, because since those numbers aren't like terms, that is as simple as you can make it.
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12
The numbers are 9 and 45. a = 5b a - 18 = 3b which becomes a = 3b + 18 Therefore: 5b = 3b + 18 18 = 2b b = 9 a = 45
18
-18
If B equals 8, then the equation is: 20-8=? The answer is 12.