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