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(1/x)+(1/y)=0,5
x+y=3x-3y
(1/x)+(1/y)=0,5
x=2y
(1/2y)+(1/y)=0,5
x=2y
1/2y=0,5-(1/y)
x=2y
1=y-2
x=2y
y=3
x=6
y=3