17-х=8
x=17-8
x=9
13-а=9
a=13-9
a=4
90-с=60
c=90-60
c=30
17-х=8 x=17-8 x=9
13-а=9 a=13-9 a=4
90-с=60 c=90-60 c=30
17-х=8
x=17-8
x=9
13-а=9
a=13-9
a=4
90-с=60
c=90-60
c=30
17-х=8 x=17-8 x=9
13-а=9 a=13-9 a=4
90-с=60 c=90-60 c=30