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x in (-oo:+oo)
x+1/5 = x/7 // - x/7
x-(x/7)+1/5 = 0
6/7*x+1/5 = 0 // - 1/5
6/7*x = -1/5 // : 6/7
x = -1/5/6/7
x = -7/30
x = -7/30
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