146. Доведіть тотожність: 1) -0,2 (469) + 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) -(3y-27)-2(121-1,5)-18.​
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