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x-2y= -8 | x2 | 2x-4y= -16
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7y= 35
y= 5
x-2y= -8
x-2(5)= -8 maka, nilai x - 10y
x-10= -8 = 2-10(5)
x= -8+10 = 2-50
x= 2 = -48