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2x+2y-x+y=10
2x+x+2y+y=10
3x+3y=10
3(x+y)+(x-y)=10
3x+3y+x-y=10
3x+x+3y+y=10
4x+4y=10
Metode gabungan
3x+3y=10 ( x4 ) 12x+12y=40
4x+4y=10 ( x3 ) 12x+12y=30 -
=10
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