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y in (-oo:+oo)
6/7 = y/42 // - y/42
6/7-(y/42) = 0
6/7-1/42*y = 0 // - 6/7
-1/42*y = -6/7 // : -1/42
y = -6/7/(-1/42)
y = 36
y = 36
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