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