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x in (-oo:+oo)
3/7 = 4*x // - 4*x
3/7-(4*x) = 0
3/7-4*x = 0
3/7-4*x = 0 // - 3/7
-4*x = -3/7 // : -4
x = -3/7/(-4)
x = 3/28
x = 3/28
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