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