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x in (-oo:+oo)
x/(-4) = 12/5 // - 12/5
x/(-4)-(12/5) = 0
x/(-4)-12/5 = 0
-1/4*x-12/5 = 0 // + 12/5
-1/4*x = 12/5 // : -1/4
x = 12/5/(-1/4)
x = -48/5
x = -48/5
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