Question

172+3x  =178 

______    ___

   2+3x         8

Answer 1

(172+3x)/(2+3x)=178/8

170/(3x+2)=21.25
3x+2=170/21.25
3x+2=8
3x=6 

x=6/3
x=2

Answer 2

$frac{172+3x}{2+3x} =frac{178}{8}$

ОДЗ:

2+3x≠0

3x≠-2

x≠ -2/3

$8(172+3x) =178(2+3x)\ 1376+24x=356+534x\ 534x-24x=1376-356\ 510x=1020\ x=1020:510\ x=2$

Ответ: 2