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x in (-oo:+oo)
x/5 = 3*x-(4/7) // - 3*x-(4/7)
x/5-(3*x)+4/7 = 0
x/5-3*x+4/7 = 0
4/7-14/5*x = 0 // - 4/7
-14/5*x = -4/7 // : -14/5
x = -4/7/(-14/5)
x = 10/49
x = 10/49
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