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y in (-oo:+oo)
y/12 = 51/2 // - 51/2
y/12-(51/2) = 0
y/12-51/2 = 0
1/12*y-51/2 = 0 // + 51/2
1/12*y = 51/2 // : 1/12
y = 51/2/1/12
y = 306
y = 306
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