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x in (-oo:+oo)
((8*x)/10)*y = (3*x)/8 // - (3*x)/8
((8*x)/10)*y-((3*x)/8) = 0
(-3/8)*x+((8*x)/10)*y = 0
4/5*x*y = 0 // : 4/5*y
x = 0
x = 0
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