Ответ:
-9х+9у-14у+28х-17х+12у=(-9+28-17)х+(9-14+12)у=2х+7у
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Ответ:
Ответ:
-9х+9у-14у+28х-17х+12у=(-9+28-17)х+(9-14+12)у=2х+7у