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y in (-oo:+oo)
(-1/2)*y = -4.1 // + 4.1
(-1/2)*y+4.1 = 0
4.1-1/2*y = 0 // - 4.1
-1/2*y = -4.1 // : -1/2
y = -4.1/(-1/2)
y = 8.2
y = 8.2
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