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y in (-oo:+oo)
7/3-(y/4) = 7/12 // - 7/12
7/3-(y/4)-(7/12) = 0
7/3-(y/4)-7/12 = 0
7/4-1/4*y = 0 // - 7/4
-1/4*y = -7/4 // : -1/4
y = -7/4/(-1/4)
y = 7
y = 7
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