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x in (-oo:+oo)
12/5 = 4*x // - 4*x
12/5-(4*x) = 0
12/5-4*x = 0
12/5-4*x = 0 // - 12/5
-4*x = -12/5 // : -4
x = -12/5/(-4)
x = 3/5
x = 3/5
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