(2y+6)÷3-4=y÷2+1
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(2у+6):3-4=у:2+1(2у+6):3=у:2+5у=9+15-6у=18.                   проверка   (2*18+6):3-4=18:2+1                                             42:3-4=9+1                                               14-4=10                                                  10=10.