7у-12у-20=2-15+6у-6
7у-12у-6у=2-15-6+20
-11у=1
у=-1/11
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-5у-6у=-19+20
-11у=1
У=-1/11
7у-12у-20=2-15+6у-6
7у-12у-6у=2-15-6+20
-11у=1
у=-1/11