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x in (-oo:+oo)
(1/3)*x+(1/5)*y = 8 // - 8
(1/3)*x+(1/5)*y-8 = 0
1/3*x+1/5*y-8 = 0 // - 1/5*y-8
1/3*x = -(1/5*y-8) // : 1/3
x = (-(1/5*y-8))/1/3
x = 3*(8-(1/5*y))
x = 3*(8-(1/5*y))
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