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x in (-oo:+oo)
y-5 = (3/4)*(x-4) // - (3/4)*(x-4)
y-((3/4)*(x-4))-5 = 0
(-3/4)*(x-4)+y-5 = 0
y-3/4*(x-4)-5 = 0
y-3/4*(x-4)-5 = 0
y-3/4*x-5+3 = 0
y-3/4*x-2 = 0
y-3/4*x-2 = 0
y-3/4*x-2 = 0 // - y-2
-3/4*x = -(y-2) // : -3/4
x = (-(y-2))/(-3/4)
x = -4/3*(2-y)
x = -4/3*(2-y)
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