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x in (-oo:+oo)
x = x/7+1/5+303 // - x/7+1/5+303
x-(x/7)-(1/5)-303 = 0
x-(x/7)-1/5-303 = 0
6/7*x-1516/5 = 0 // + 1516/5
6/7*x = 1516/5 // : 6/7
x = 1516/5/6/7
x = 5306/15
x = 5306/15
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