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2x+6y=104.000|×3|6x+18y=312.000_
=-10y=-150.000
y= -150.000/-10
y =15000
3x+4y=81000
3x+60.000=81000
3x =81.000-60.000
=21000
. x= 21.000/3
=7000
5x+5y
35.000+75.000
=110.000