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x in (-oo:+oo)
(-3/6)*x = 12/18 // - 12/18
(-3/6)*x-(12/18) = 0
(-3/6)*x-2/3 = 0
-1/2*x-2/3 = 0 // + 2/3
-1/2*x = 2/3 // : -1/2
x = 2/3/(-1/2)
x = -4/3
x = -4/3
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