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x in (-oo:+oo)
y-3 = 9*(x/10) // - 9*(x/10)
y-(9*(x/10))-3 = 0
(-9/10)*x+y-3 = 0
y-9/10*x-3 = 0 // - y-3
-9/10*x = -(y-3) // : -9/10
x = (-(y-3))/(-9/10)
x = -10/9*(3-y)
x = -10/9*(3-y)
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