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Доведіть тотожність:
1) –0,2 (4b – 9) + 1,4b = 0,6b + 1,8;
2) (5a – 3b) – (4 + 5a – 3b) = –4;
3) 5 (0,4x – 0,3) + (0,8 – 0,6x) = 1,4x – 0,7;
4) 1/9(3y-27)-2(1/12y-1/5)=1/6y
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