1-1 1/2у+3 2/5у=1 1/3у-2 7/15у+2 1/2
-1 1/2у+3 2/5у-1 1/3у+2 7/15у=2 1/2-1
91/30у=1 1/2
у=1 1/2:91/30
у=3/2:91/30
у=3/2*30/91
у=45/91
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1-1 1/2у+3 2/5у=1 1/3у-2 7/15у+2 1/2
-1 1/2у+3 2/5у-1 1/3у+2 7/15у=2 1/2-1
91/30у=1 1/2
у=1 1/2:91/30
у=3/2:91/30
у=3/2*30/91
у=45/91