х+20+х+5/8*(х+20+х)=65

х+20+х+5/8(х+20+х)=65
х+20+х+5/8(2х+20)=65
х+20+х+5/8×2(х+10)=65
х+20+х+5/4(х+10)=65
х+20+х+5/4х+25/2=65
2х+65/2+5/4х=65
8х+130+5х=260
13х=260-130
13х=130
х=10
Ответ: х=10