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x in (-oo:+oo)
y+3 = (7/9)*(x+3) // - (7/9)*(x+3)
y-((7/9)*(x+3))+3 = 0
(-7/9)*(x+3)+y+3 = 0
y-7/9*(x+3)+3 = 0
y-7/9*(x+3)+3 = 0
y-7/9*x-7/3+3 = 0
y-7/9*x+2/3 = 0
y-7/9*x+2/3 = 0
y-7/9*x+2/3 = 0 // - y+2/3
-7/9*x = -(y+2/3) // : -7/9
x = (-(y+2/3))/(-7/9)
x = 9/7*(y+2/3)
x = 9/7*(y+2/3)
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