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x in (-oo:+oo)
y-5 = (9/4)*(x-2) // - (9/4)*(x-2)
y-((9/4)*(x-2))-5 = 0
(-9/4)*(x-2)+y-5 = 0
y-9/4*(x-2)-5 = 0
y-9/4*(x-2)-5 = 0
y-9/4*x-5+9/2 = 0
y-9/4*x-1/2 = 0
y-9/4*x-1/2 = 0
y-9/4*x-1/2 = 0 // - y-1/2
-9/4*x = -(y-1/2) // : -9/4
x = (-(y-1/2))/(-9/4)
x = -4/9*(1/2-y)
x = -4/9*(1/2-y)
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