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x in (-oo:+oo)
(1/3)*x+(1/5)*y = -2/3 // + -2/3
(1/3)*x+(1/5)*y-(-2/3) = 0
(1/3)*x+(1/5)*y+2/3 = 0
1/3*x+1/5*y+2/3 = 0 // - 1/5*y+2/3
1/3*x = -(1/5*y+2/3) // : 1/3
x = (-(1/5*y+2/3))/1/3
x = -3*(1/5*y+2/3)
x = -3*(1/5*y+2/3)
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