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x in (-oo:+oo)
11/8 = x/4 // - x/4
11/8-(x/4) = 0
11/8-1/4*x = 0 // - 11/8
-1/4*x = -11/8 // : -1/4
x = -11/8/(-1/4)
x = 11/2
x = 11/2
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