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y in (-oo:+oo)
1/2-(7/3) = y/7 // - y/7
1/2-(y/7)-(7/3) = 0
1/2-(y/7)-7/3 = 0
-1/7*y-11/6 = 0 // + 11/6
-1/7*y = 11/6 // : -1/7
y = 11/6/(-1/7)
y = -77/6
y = -77/6
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