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x in (-oo:+oo)
(1/4)*(2*x-3)-((1/5)*(x-4)) = o // - o
(1/4)*(2*x-3)-((1/5)*(x-4))-o = 0
(1/4)*(2*x-3)+(-1/5)*(x-4)-o = 0
1/4*(2*x-3)-1/5*(x-4)-o = 0
1/4*(2*x-3)-1/5*(x-4)-o = 0
3/10*x-o+1/20 = 0
3/10*x-o+1/20 = 0
3/10*x-o+1/20 = 0 // - 1/20-o
3/10*x = -(1/20-o) // : 3/10
x = (-(1/20-o))/3/10
x = 10/3*(o-1/20)
x = 10/3*(o-1/20)
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