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cat: kelompokan variabel yg sama kemudian jumlahkan/kurangkan
(5x-6y+8z) + (7x-9z) - (2y+9z-10)=?
= 5x+7x-6y-2y+8z-9z-9z+10
=12x-8y-10z+10
semoga membantu :)