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x in (-oo:+oo)
x+3/4 = x+x+1/2+4/5 // - x+x+1/2+4/5
x-x-x+3/4-(1/2)-(4/5) = 0
x-x-x+3/4-1/2-4/5 = 0
-x-11/20 = 0 // + 11/20
-x = 11/20 // * -1
x = -11/20
x = -11/20
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