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x in (-oo:+oo)
(1/5)*x-(1/2) = (1/20)*(4*x-5)-(3/4) // - (1/20)*(4*x-5)-(3/4)
(1/5)*x-((1/20)*(4*x-5))-(1/2)+3/4 = 0
(-1/20)*(4*x-5)+(1/5)*x-1/2+3/4 = 0
x/5-1/20*(4*x-5)-1/2+3/4 = 0
(-1/20*2*4*5*(4*x-5))/(2*4*5)+(2*4*x)/(2*4*5)+(-1*4*5)/(2*4*5)+(2*3*5)/(2*4*5) = 0
2*4*x-1/20*2*4*5*(4*x-5)-1*4*5+2*3*5 = 0
10-20+30 = 0
30-10 = 0
20 = 0
20/(2*4*5) = 0
20/(2*4*5) = 0 // * 2*4*5
20 = 0
20 = 0
x belongs to the empty set
x belongs to the empty set
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