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x in (-oo:+oo)
(2/3)*(6*y+9) = (3/5)*(15*x-20) // - (3/5)*(15*x-20)
(2/3)*(6*y+9)-((3/5)*(15*x-20)) = 0
(2/3)*(6*y+9)+(-3/5)*(15*x-20) = 0
2/3*(6*y+9)-3/5*(15*x-20) = 0
2/3*(6*y+9)-3/5*(15*x-20) = 0
4*y-9*x+18 = 0
4*y-9*x+18 = 0
4*y-9*x+18 = 0 // - 4*y+18
-9*x = -(4*y+18) // : -9
x = (-(4*y+18))/(-9)
x = (4*y+18)/9
x = (4*y+18)/9
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