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x in (-oo:+oo)
x = (4*y)/10 // - (4*y)/10
x-((4*y)/10) = 0
x+(-2/5)*y = 0
x-2/5*y = 0 // + -2/5*y
x = -(-2/5*y)
x = 2/5*y
x = 2/5*y
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