8*(0.7x-4)-2(0.2x-3)=-39
5.6x-32-0.4x+6=-39
5.2x=-39-6+32
5.2x=12
x=2.5
Ответ: x=2.5
2,7=2 7/10
31,4=31 4\10
567,39=567 39/100
6,005=6 5/1000
42,78=42 78/100
0,64= 64/100
0,07=7/100
0,99= 99/100
125*48-31*82-631*43+125*83=6000-2542-27133+10375= - 13300
2/11-1/12= 24/132-11/132=13/132