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x in (-oo:+oo)
(1*x)/2 = -2 // + 2
(1*x)/2+2 = 0
x/2+2 = 0
1/2*x+2 = 0 // - 2
1/2*x = -2 // : 1/2
x = -2/1/2
x = -4
x = -4
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