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3*(28/13)-(2*y) = 6 // - 6
3*(28/13)-(2*y)-6 = 0
3*(28/13)-2*y-6 = 0
6/13-2*y = 0 // - 6/13
-2*y = -6/13 // : -2
y = -6/13/(-2)
y = 3/13
y = 3/13
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