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x in (-oo:+oo)
y-x = (1/3)*(x+14) // - (1/3)*(x+14)
y-((1/3)*(x+14))-x = 0
(-1/3)*(x+14)-x+y = 0
y-1/3*(x+14)-x = 0
y-1/3*(x+14)-x = 0
y-4/3*x-14/3 = 0
y-4/3*x-14/3 = 0
y-4/3*x-14/3 = 0 // - y-14/3
-4/3*x = -(y-14/3) // : -4/3
x = (-(y-14/3))/(-4/3)
x = -3/4*(14/3-y)
x = -3/4*(14/3-y)
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