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