Объяснение:
3(0.6x+y)-7(3x-y)= 1.8x+3y-21x+7y= -19.2x+10y
(-19.2*5)+(10*3.8)= -96+38= -58
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Объяснение:
3(0.6x+y)-7(3x-y)= 1.8x+3y-21x+7y= -19.2x+10y
(-19.2*5)+(10*3.8)= -96+38= -58