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