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x in (-oo:+oo)
(1/3)*x+(1/5)*y = -4/15 // + -4/15
(1/3)*x+(1/5)*y-(-4/15) = 0
(1/3)*x+(1/5)*y+4/15 = 0
1/3*x+1/5*y+4/15 = 0 // - 1/5*y+4/15
1/3*x = -(1/5*y+4/15) // : 1/3
x = (-(1/5*y+4/15))/1/3
x = -3*(1/5*y+4/15)
x = -3*(1/5*y+4/15)
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