1.
3/4X-5x%=17.5
0.7x=17.5
x=25
2.
(22又2/3+x)除以3又3/4-0.4=32/45
(22又2/3+x)除以3又3/4=1又1/9
22又2/3+x=8/27
x=-22又10/27