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x in (-oo:+oo)
(-4/11)*x = 12/143 // - 12/143
(-4/11)*x-(12/143) = 0
(-4/11)*x-12/143 = 0
-4/11*x-12/143 = 0 // + 12/143
-4/11*x = 12/143 // : -4/11
x = 12/143/(-4/11)
x = -3/13
x = -3/13
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