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x-2y=2
---------- -
-1y = -1
y = 1
x-3.1=1
x-4=1
x=1+4
x=5
nilai 2x-5y
= 2.5-5.1
= 10-5
= 5
x-3y=1 P1
x-2y=2 P2
P1 +P2
2x - 5y =3
jadi nilai 2x - 5y adalah 3