Очень срочно помогите пожалуйста. Докажите тождество:
1) -0,2(4b - 9) + 1,4b = 0,6 + 1,8
2) (5а - 3b) - (4 + 5a - 3b) = -4
3) 5(0,4 - 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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