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x in (-oo:+oo)
28/30 = x/4 // - x/4
28/30-(x/4) = 0
14/15-1/4*x = 0 // - 14/15
-1/4*x = -14/15 // : -1/4
x = -14/15/(-1/4)
x = 56/15
x = 56/15
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