Question

If A = 8x - 3y + 9, B = - y - 9 and C = 4x - y - 9 find A + B - C.

Answer 1

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Answer 2

A+B+C= (8x-3y+9) + (-y-9 ) - (4x-y-9)
= 8x-3y+9-y-9-4x+y+9
= 8x-4x-3y-y-y+9-9+9
= 4x-3y+9