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y in (-oo:+oo)
12-((6/7)*y) = 5 // - 5
12-((6/7)*y)-5 = 0
(-6/7)*y-5+12 = 0
7-6/7*y = 0 // - 7
-6/7*y = -7 // : -6/7
y = -7/(-6/7)
y = 49/6
y = 49/6
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