Bài 2 : Tìm x , biết :
a , \(\frac{1}{2}xX-\frac{2}{3}+0,75=1,25X\frac{2}{3}\) b , 1 - \(\left(5\frac{3}{8}+x-7\frac{5}{24}\right):16\frac{2}{3}=0\) c , (X+1) + (X+2) + (X+3) + (X+4) + ..... + (X+28) = 555
d, (X+4) + (x+6) + (X+8) + ... + (X+26) = 210