2,6(3x+3 1/2)-2,1 / 1,2 - 2,7(2 1/4 - 2,1x) - 1 / 0,7=10
13/5 × (3x+3/2)-21/10 / 6/5 - 27/10×(9/4-21/10x) - 1 / 7/10=10
39/5x-39/10-21/10 / 6/5 - 27/20- 576/100x-1 / 7/10 =10
39/5x-6 / 6/5 - 7/20 - 576/10x / 7/10=10
39x-30/5 / 6/5 - 35-576x/100 / 7/10 =10
39x-30/6 - 35-576x/70=10
35×(39x-30)-3×(35-576x)=2100
1365x-1050-105+1701x=2100
3066x-1155=2100
3066x=2100+1155
3066x=3255
X=3255/3066
X=155/146
X=1 9/146
Ответ: 1 9/146