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x in (-oo:+oo)
x+(2/5)*y = -8/5 // + -8/5
x+(2/5)*y-(-8/5) = 0
x+(2/5)*y+8/5 = 0
x+2/5*y+8/5 = 0 // - 2/5*y+8/5
x = -(2/5*y+8/5)
x = -(2/5*y+8/5)
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