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2. jawaban nomer 2 adalah 5X-Y-4
(5z +3) -(2z -7)
5z +3 -2z +7
5z -2z +3 +7
3z +10
2. Kalau soalnya dari, berarti dibalik dahulu
(x -y) -(6x +4)
x -y -6x -4
x -6x -y -4
-5x -y -4