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x in (-oo:+oo)
x/(-4) = 3/5 // - 3/5
x/(-4)-(3/5) = 0
x/(-4)-3/5 = 0
-1/4*x-3/5 = 0 // + 3/5
-1/4*x = 3/5 // : -1/4
x = 3/5/(-1/4)
x = -12/5
x = -12/5
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