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x in (-oo:+oo)
y = (3/8)*x-13 // - (3/8)*x-13
y-((3/8)*x)+13 = 0
(-3/8)*x+y+13 = 0
y-3/8*x+13 = 0 // - y+13
-3/8*x = -(y+13) // : -3/8
x = (-(y+13))/(-3/8)
x = 8/3*(y+13)
x = 8/3*(y+13)
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