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