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y in (-oo:+oo)
2.3 = (1/2)*y // - (1/2)*y
2.3-((1/2)*y) = 0
(-1/2)*y+2.3 = 0
2.3-1/2*y = 0 // - 2.3
-1/2*y = -2.3 // : -1/2
y = -2.3/(-1/2)
y = 4.6
y = 4.6
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