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x in (-oo:+oo)
y-7 = (1/3)*x-2 // - (1/3)*x-2
y-((1/3)*x)-7+2 = 0
(-1/3)*x+y-7+2 = 0
y-1/3*x-5 = 0 // - y-5
-1/3*x = -(y-5) // : -1/3
x = (-(y-5))/(-1/3)
x = -3*(5-y)
x = -3*(5-y)
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