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x in (-oo:+oo)
(2/3)*x+(2/5)*y = -16 // + 16
(2/3)*x+(2/5)*y+16 = 0
2/3*x+2/5*y+16 = 0 // - 2/5*y+16
2/3*x = -(2/5*y+16) // : 2/3
x = (-(2/5*y+16))/2/3
x = -3/2*(2/5*y+16)
x = -3/2*(2/5*y+16)
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