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