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y in (-oo:+oo)
7/2 = y/6 // - y/6
7/2-(y/6) = 0
7/2-1/6*y = 0 // - 7/2
-1/6*y = -7/2 // : -1/6
y = -7/2/(-1/6)
y = 21
y = 21
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