X x 2,9 + X : 10 = 1,05
.....................................................
....................................................
....................................................
......................................................
......................................................
....................................................
..................................................
..............................................,...
.....................................................
x*2,9+x.0,1=1,05
x*(2,9+0,1)=1,05
x*3=1,05
x=1,05:3
x=1,05:3
x=0,35
**** nhé Thư xinh xắn