816./1) 9 - 7y = 2,5 - 3y; 2) 3,2 - 5a = -1,8a + 4; ; 3) 0,8x - 3,5 = -1,2x + 0,5; 4) 8,6x - 3,7 = 7,6x - 5. :-помогите срочно!!!!! ​
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