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y in (-oo:+oo)
y-(y/2) = 7/2 // - 7/2
y-(y/2)-(7/2) = 0
y-(y/2)-7/2 = 0
1/2*y-7/2 = 0 // + 7/2
1/2*y = 7/2 // : 1/2
y = 7/2/1/2
y = 7
y = 7
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