No.
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-20
A+5=-5a+5 A=-5a+5-5 (bring one of the 5 over)(not necessary) A=-5a (if big and small letters are the same, A=a=0; if not, when A=35,a=-7)
-45 over 9 = -5 -5 plus 5 = 0 QED -45 over (9 plus 5) is a different matter and = -3.2143.
f(x) = (3x - 4)/5 f(0) = [3(0) - 4]/5 = -4/5
0 it equals 0