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=> 10x + 2 - 15xy + x2 + y2
=> x2 -13xy + 10 + y2
24. -7x + 3 < 38
=> -7x < 38 - 3
=> -7x < 35
=> x < 35/-7
=> x > -5
tanda dibalik menjadi x lebih besar sama dengan -5 karena dibagi bilangan negatif