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-2x+3y=-16 (dikali 4)
9x+12y=21
-8x+12y=-64
Dikurangi menjadi
17x=85
x = 85/17
x = 5
3(5)+4y=7
15+4y=7
4y= - 8
y= - 2
2x-7y
=2(5)-7(-2)
=15+14
=29