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x in (-oo:+oo)
y+1 = (2/3)*(x-7) // - (2/3)*(x-7)
y-((2/3)*(x-7))+1 = 0
(-2/3)*(x-7)+y+1 = 0
y-2/3*(x-7)+1 = 0
y-2/3*(x-7)+1 = 0
y-2/3*x+1+14/3 = 0
y-2/3*x+17/3 = 0
y-2/3*x+17/3 = 0
y-2/3*x+17/3 = 0 // - y+17/3
-2/3*x = -(y+17/3) // : -2/3
x = (-(y+17/3))/(-2/3)
x = 3/2*(y+17/3)
x = 3/2*(y+17/3)
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