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x in (-oo:+oo)
y+3 = (7/3)*(x+3) // - (7/3)*(x+3)
y-((7/3)*(x+3))+3 = 0
(-7/3)*(x+3)+y+3 = 0
y-7/3*(x+3)+3 = 0
y-7/3*(x+3)+3 = 0
y-7/3*x-7+3 = 0
y-7/3*x-4 = 0
y-7/3*x-4 = 0
y-7/3*x-4 = 0 // - y-4
-7/3*x = -(y-4) // : -7/3
x = (-(y-4))/(-7/3)
x = -3/7*(4-y)
x = -3/7*(4-y)
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