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x in (-oo:+oo)
x/2-x+2/11 = 4 // - 4
x/2-x+2/11-4 = 0
-1/2*x-42/11 = 0 // + 42/11
-1/2*x = 42/11 // : -1/2
x = 42/11/(-1/2)
x = -84/11
x = -84/11
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