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x in (-oo:+oo)
7/4 = x+3/5 // - x+3/5
7/4-x-(3/5) = 0
7/4-x-3/5 = 0
23/20-x = 0 // - 23/20
-x = -23/20 // * -1
x = 23/20
x = 23/20
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