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x in (-oo:+oo)
7/28 = x/4 // - x/4
7/28-(x/4) = 0
1/4-1/4*x = 0 // - 1/4
-1/4*x = -1/4 // : -1/4
x = -1/4/(-1/4)
x = 1
x = 1
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