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