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x in (-oo:+oo)
(3/5)*(15-(10*x)-(20*y)) = 0
(3/5)*(15-10*x-20*y) = 0
3/5*(15-10*x-20*y) = 0
( 15-10*x-20*y )
15-10*x-20*y = 0 // - 15-20*y
-10*x = -(15-20*y) // : -10
x = (-(15-20*y))/(-10)
x = (15-20*y)/10
( 3/5 )
3/5 = 0
x belongs to the empty set
x = (15-20*y)/10
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