28) (a-4b)+3b-a;
29) -(4a+3)+4a-3;
30) (2a-4b+3)-2a+3b;
31) -(-5+2a+b) + 2a;
32) (6a+2b+3)-(b+6a);
33) -(4x-3y-1)+4x-1;
51) 5(t-7)-(-40+5t);
52) 6(y-3)-5y +18;
53) -(1-x)+3(x+2)-4x;
54) 2+3-(22+4)+1;
55) -2(0,4-3a-b)-2b;
56) 5(2t-1)-(-4+5t);
57) 2f-4(f+3)+2f;
58) -1,1(x-3y)-0,3y;
Помогите,дам 50баллов срочно​
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