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x in (-oo:+oo)
y = (5/9)*x-15 // - (5/9)*x-15
y-((5/9)*x)+15 = 0
(-5/9)*x+y+15 = 0
y-5/9*x+15 = 0 // - y+15
-5/9*x = -(y+15) // : -5/9
x = (-(y+15))/(-5/9)
x = 9/5*(y+15)
x = 9/5*(y+15)
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