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y in (-oo:+oo)
14 = (1/2)*y // - (1/2)*y
14-((1/2)*y) = 0
(-1/2)*y+14 = 0
14-1/2*y = 0 // - 14
-1/2*y = -14 // : -1/2
y = -14/(-1/2)
y = 28
y = 28
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