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3x-2y=9. =x1 = 3x-2y= 9 hasil ini dikurang
sehingga menjadi 5y = 15
y = 15/3
y = 5
x + y = 8
x + 5 = 8
x. = 8-5
x. = 3
maka 3a + b
=3(3) + 5
= 9 + 5
= 14 (b)