4,7-2,5у-12,4=19
-2,5у-7,7=19
-2,5у=7,7+19
-2,5у=26,7
у=26,7:(-2,5)=-10,68
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4,7-2,5у-12,4=19
-2,5у-7,7=19
-2,5у=7,7+19
-2,5у=26,7
у=26,7:(-2,5)=-10,68