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y in (-oo:+oo)
y/2 = 8.2 // - 8.2
y/2-8.2 = 0
1/2*y-8.2 = 0 // + 8.2
1/2*y = 8.2 // : 1/2
y = 8.2/1/2
y = 16.4
y = 16.4
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