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= y - 13 : 4 - 13 = x - 2 : 5 - 2
= y - 13 : -9 = x - 2 : 3
= -9( x - 2) = 3(y - 13)
= -9x + 18 = 3y - 39
= -9x - 3y = -39 - 18
= -9x - 3y = -57
= -3y = 9x - 57
= 9 : -3
= -3
Jawaban : D
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