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x in (-oo:+oo)
y-5 = (1/4)*(x-1) // - (1/4)*(x-1)
y-((1/4)*(x-1))-5 = 0
(-1/4)*(x-1)+y-5 = 0
y-1/4*(x-1)-5 = 0
y-1/4*(x-1)-5 = 0
y-1/4*x-5+1/4 = 0
y-1/4*x-19/4 = 0
y-1/4*x-19/4 = 0
y-1/4*x-19/4 = 0 // - y-19/4
-1/4*x = -(y-19/4) // : -1/4
x = (-(y-19/4))/(-1/4)
x = -4*(19/4-y)
x = -4*(19/4-y)
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