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x in (-oo:+oo)
x = (2/5)*y-3 // - (2/5)*y-3
x-((2/5)*y)+3 = 0
x+(-2/5)*y+3 = 0
x-2/5*y+3 = 0 // - 3-2/5*y
x = -(3-2/5*y)
x = -(3-2/5*y)
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