Verified answer

1) (x-5)/2= (9-x)/3 ; 3x -15 = 18 -2x; 5x=33; x= 6,6;

2)(8+x)/7 = (3x-5)/6,5; 14,5x= 87; x=6;

3)(7x+9)/2,5=(5x-2)/6; 42x+54 = 12,5x-5; 29,5x = -59; x=2;

4)0,6(x-3) = 2,1/(x+2); 0,6x+1,2=2,1x-6,3; 1,5x=7,5; x= 5;