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5a - 3a -10b -4b
2a -14b
b. (6x-8y +1) - ( 2x-y+5) ... kumpulkan variabel yang sejenis
6x - 2x - 8y + y +1 -5
4x - 7y -4
2.6x-8y+1 dari 2x-y+5= 2x-6x-y-8y+5+1= -4x-9y+6