Ответ:
−(7.8y+11x)−(−19y−3.1x)=−7.8y−11x+19y+3.1x=7.9x−11.2y
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Ответ:
−(7.8y+11x)−(−19y−3.1x)=−7.8y−11x+19y+3.1x=7.9x−11.2y