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a.-2x-4y+3x-3y=x-y
b.8a-4b-2a-6b=4a-10b
c.-12x+3y²+6x-15y²=-12y²-6x
b. 8a-4b-2a-6b=6a-10b
c. -12x-3y"+6x-15y"=-6x-18y"
4. a. 10x+18y = 2(5x+9y)
b. -2(5a-2b+6c)
"= kuadran 2