50+4c+(3c-15)-10-7=50+4c+3c-15-10-7 = (50-15-10-7)+(4c+3c) = 18+7с
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50+4c+(3c-15)-10-7=50+4c+3c-15-10-7 = (50-15-10-7)+(4c+3c) = 18+7с