ПОМОГИТЕ ПОЖАЛУЙСТА!!!!!упростите выражение.1) -а-(+а)+2б-(-б)

2)-а-(-б)-4а.

Решите уравнение 1) (1целая дробь 1/12+3,75)-(-х)=4,5

2)х-(7целая дробь 5/9 - 5целая дробь 1/6)=-3,5

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