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x in (-oo:+oo)
5-(x/7) = x-(3/3) // - x-(3/3)
3/3-(x/7)-x+5 = 0
6-8/7*x = 0 // - 6
-8/7*x = -6 // : -8/7
x = -6/(-8/7)
x = 21/4
x = 21/4
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