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