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5x-3y=7
___________
10x+10y=40
10x-6y=14
___________-
16y=54
y=4
atas dikalikan 5
bawah dikalikan 2
2x+2y=8
5x-3y=7
_________
6x+6y=24
10x-6y=14
_________+
16x=38
x=3
atas dikalikan 3
bawah dikalikan 2