50 = sx3
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When c = -3 then 4c + 5c - 2 = [4 x -3] + [5 x -3] - 2 = -12 +(-15) - 2 = -12 -15 -2 = -29
10+5c
C = D C = 10 utils, and D = 10 utils
You can't tell a thing about -5c+9 until you know what 'c' is. And every time 'c' changes, -5c+9 changes.
The answer is usually written as:5c If you want the result as a number, that will depend on how much "c" is.