Решите уравнения 
1)5+3,6х=1,9х-16+1,7х                     
2) 2,5-3,7у=1,8-6у+0,7+2,3у   
3)7,2у-3,1=4,3у+5+2,9у
4)6,5х-4-3,1х=1.8х-4+1,6х      
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