answer 3 rd one please fast
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Step-by-step explanation:
Sum = x + 3y + ( - 3x - y )
Sum = x - 3x + 3 y - y
Sum = -2x + 2y
Now Subtracting f
= -2x + 2y - ( x - y )
= -2x + 2y - x + y
= -2x - x + 2y + y
= -3x + 3y
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