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x in (-oo:+oo)
-x/4 = -5.5 // + 5.5
5.5-x/4 = 0
5.5-1/4*x = 0 // - 5.5
-1/4*x = -5.5 // : -1/4
x = -5.5/(-1/4)
x = 22
x = 22
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