If A = 2x – y + 3xy, B = -x + 2xy + 3y and C = -3y -4 x + 7xy, find the value of A+B+C.
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Answer:
A= 2x-y+3xy
= 2x-y+3xy
B= -x+2xy+3y
= -x+2xy+3y
C= -3y -4x+7xy
= -3y -4x+ 7xy
A+B+C =
2x-y+3xy - x+2xy+3y - 3y-4x+7xy =
= 2x-x-4x - y+3y-3y + 3xy+2xy+7xy=
= x-4x + 2y-3y + 5xy+7xy=
= -5x - y + 12xy
= -5x-y+12xy
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