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2. -12 x . 1/3 x -12x.-1/4y+-12x.5/12=-4x pangkat 2 +3xy-5
3.5.2a-5.b+2.a-2.b= 10a-5b+2a-2b=10a+2a-5b-2b=12a-7b
4.3.2x+3.y-4.3y-4.-3y=6x+3y-12y+12Y=6x-12x+3y-0=-6x+3y