3/5 = 9/15 and is not equal to 12/15
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12
5 + -8 = 3 + 12 -3 is not equal to 15
your expression is this... n+5=3+12 n+5=15 n=10
When c = -3 then 4c + 5c - 2 = [4 x -3] + [5 x -3] - 2 = -12 +(-15) - 2 = -12 -15 -2 = -29
It is 15 because 15/3 = 5