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x + 5y = 9 ......(2)
subtitusikan
x + 5 ( 3x - 11 ) = 9
x+15x-55= 9
16x = 9 + 55
x = 64/16
x = 4
y = 3x - 11
= 3.4 - 11
= 12 - 11
= 1
jadi,2x - 5y = 2 ( 4) - 5 (1)
= 8 - 5 = 3