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x in (-oo:+oo)
7/15 = x/2 // - x/2
7/15-(x/2) = 0
7/15-1/2*x = 0 // - 7/15
-1/2*x = -7/15 // : -1/2
x = -7/15/(-1/2)
x = 14/15
x = 14/15
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