if "a" i equal to "1" that means that "b" is equal to "2" so that clearly means that "c" is equal to "3", so if we do "a + a - b" is "1 + 1 - 2" and that is equal to "0", if we do "abc" is "123" and "123 x 123" is equal to "15129" so that means that if we do "15129 - 123 x 123" is equal to "0" and "a+" is "1.5" and "a-" is equal to "0.5" and the same with "b" and "c" and that means that "a++" is equal to "b" and, as we already know, "b" is equal to "2", so, if we do "a++ - b--" is equal to "1" and the same with "c" "d" etc.
guys, what you need to do is something like that, and, yea, im a horrible teacher, i just said you what do you need to do the day you need to say me if you have do it, but, im not that bad because i will give you 1 week more