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x in (-oo:+oo)
12/7 = 4*x // - 4*x
12/7-(4*x) = 0
12/7-4*x = 0
12/7-4*x = 0 // - 12/7
-4*x = -12/7 // : -4
x = -12/7/(-4)
x = 3/7
x = 3/7
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