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y in (-oo:+oo)
28/42 = y/12 // - y/12
28/42-(y/12) = 0
2/3-1/12*y = 0 // - 2/3
-1/12*y = -2/3 // : -1/12
y = -2/3/(-1/12)
y = 8
y = 8
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