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y in (-oo:+oo)
24/42 = y/7 // - y/7
24/42-(y/7) = 0
4/7-1/7*y = 0 // - 4/7
-1/7*y = -4/7 // : -1/7
y = -4/7/(-1/7)
y = 4
y = 4
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