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x1=7,x2=-1/2
2x1+3x2=2.7+3(-1/2)
=14-3/2
=25/2=12,5
x=-1/2 atau x=7
jika x2<x1 maka
x1=7 dan x2=-1/2
2x1+3x2=2(7)+3(-1/2)=14-3/2=25/2