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x in (-oo:+oo)
y = (5/9)*x-(51/9) // - (5/9)*x-(51/9)
y-((5/9)*x)+51/9 = 0
(-5/9)*x+y+51/9 = 0
y-5/9*x+17/3 = 0 // - y+17/3
-5/9*x = -(y+17/3) // : -5/9
x = (-(y+17/3))/(-5/9)
x = 9/5*(y+17/3)
x = 9/5*(y+17/3)
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