СРОЧНО, ПОЖАЛУЙСТА ПОМОГИТЕ!!!!! Раскройте скобки и упростите выражения:
а) 7/8*(4-x)-(3/4+x)
б) -(3/19-y)-1/2(y+2/19)
в) -7/13*(26/27+x)-(4/9-x)
г) -(1/16-y)+3/4(1/8+y)

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