Упростить 1) -(2а+3)+(4-3а); 2) 2(3-5x)-2(5+x); 3) (-2/3a+3/5b)-(2/5a-2/4b); 4) 2(1/4-3/4x)-3(5/6x+2)+1/2(2 + 1. 4/5x);
Помогите пожалуйста 40 балов
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