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