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