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3x-7y=5 |×7
21x+9y=6
21x-49y=35
-58y=29
y=29/-58
y=-0,5
3x-7(-0.5)=5
3x+3,5=5
3x=5-3,5
3x=1,5
x=1,5/3=0,5
jadi x=0,5 dan y=-0,5