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x in (-oo:+oo)
(-1/2)*x-4 = 18 // - 18
(-1/2)*x-18-4 = 0
-1/2*x-22 = 0 // + 22
-1/2*x = 22 // : -1/2
x = 22/(-1/2)
x = -44
x = -44
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