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y in (-oo:+oo)
7*(1/2)-y = 7*(3/2)-3 // - 7*(3/2)-3
7*(1/2)-y-(7*(3/2))+3 = 0
7*(1/2)-y-21/2+3 = 0
-y-4 = 0 // + 4
-y = 4 // * -1
y = -4
y = -4
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