(200+20*а):6= 60,
200+20а=60*6,
20а=360-200,
а=160/20,
а=8;
320:(b*8-40)=10,
8b-40=320/10,
8b=32+40,
b=72/8,
b=9;
(n:4-35)*6=150,
n/4-35=150/6,
n/4=25+35,
n=60*4,
n=240;
90*(m-8)+60=510
90*(m-8)=510-60,
m-8=450/90,
m=5+8,
m=13
(200+20*а):6= 60,
200+20а=60*6,
20а=360-200,
а=160/20,
а=8;
320:(b*8-40)=10,
8b-40=320/10,
8b=32+40,
b=72/8,
b=9;
(n:4-35)*6=150,
n/4-35=150/6,
n/4=25+35,
n=60*4,
n=240;
90*(m-8)+60=510
90*(m-8)=510-60,
m-8=450/90,
m=5+8,
m=13