16у-9,5у=3у+21
16-9,5у-3у=21
9,5у-3у=21-16
12,5у=21-16
12,5у=5
у=0,4
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16у-9,5у=3у+21
16-9,5у-3у=21
9,5у-3у=21-16
12,5у=21-16
12,5у=5
у=0,4