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x in (-oo:+oo)
y-((45/4)*(x-1)) = 0
(-45/4)*(x-1)+y = 0
y-45/4*(x-1) = 0
y-45/4*(x-1) = 0
y-45/4*x+45/4 = 0
y-45/4*x+45/4 = 0
y-45/4*x+45/4 = 0 // - y+45/4
-45/4*x = -(y+45/4) // : -45/4
x = (-(y+45/4))/(-45/4)
x = 4/45*(y+45/4)
x = 4/45*(y+45/4)
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