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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