Решите уравнения 1) 3(х-2) = х + 2
2) 5-2(х-1)=4-х
3) (7х+1)-(9х+3)=5

Докажите тождество
1) а-(4а-11) + (9 -2а)= 20 -5а
2) 6(3б-4)-5(3б-11)+2=3б+33=
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