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2*y-(1/3) = 4*y-(3/7) // - 4*y-(3/7)
2*y-(4*y)-(1/3)+3/7 = 0
2*y-4*y-1/3+3/7 = 0
2/21-2*y = 0 // - 2/21
-2*y = -2/21 // : -2
y = -2/21/(-2)
y = 1/21
y = 1/21
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