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(4y-8)-(2y+15z)=4y-8-2y-15z=2y-8-15z
kalau ditambah
4y-8+2y+15z=6y-8+15z
kalau dikali
(4y-8)(2y+15z)=8y²+60yz-8y-120yz=8y²-8y-60yz=4(2y²-2y-15yz)
maaf kalau salah