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