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x in (-oo:+oo)
4/10 = x+4/7 // - x+4/7
4/10-x-(4/7) = 0
4/10-x-4/7 = 0
-x-6/35 = 0 // + 6/35
-x = 6/35 // * -1
x = -6/35
x = -6/35
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