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x in (-oo:+oo)
(-2/3)*x+13 = y // - y
(-2/3)*x-y+13 = 0
13-2/3*x-y = 0 // - 13-y
-2/3*x = -(13-y) // : -2/3
x = (-(13-y))/(-2/3)
x = -3/2*(y-13)
x = -3/2*(y-13)
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