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x in (-oo:+oo)
y-2 = (3/4)*(x-4) // - (3/4)*(x-4)
y-((3/4)*(x-4))-2 = 0
(-3/4)*(x-4)+y-2 = 0
y-3/4*(x-4)-2 = 0
y-3/4*(x-4)-2 = 0
y-3/4*x-2+3 = 0
y-3/4*x+1 = 0
y-3/4*x+1 = 0
y-3/4*x+1 = 0 // - y+1
-3/4*x = -(y+1) // : -3/4
x = (-(y+1))/(-3/4)
x = 4/3*(y+1)
x = 4/3*(y+1)
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