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5x+2y=40000. (x3)
2x+3y=27000. (x2)
15x+6y=120000
4x+6y=54000
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11x=66000
x=66000/11=6000
2x+3y=27000
2(6000)+3y=27000
12000+3y=27000
3y=27000-12000
3y=15000
y=15000/3=5000
x+2y =6000+2(5000)=6000+10000=16000