-x-3y=-20 5x+3y=40
x=20-3y 5(20-3y)+3y=40 100-15y+3y=40 100-12y=40 -12y=-60 y=5 -x-3(5)=-20 -x-15=-20 -x=-5 x=5 check -5-3(5)=-20 -20=-20 5(5)+3(5)=40 25+15=40 40=40
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