a+86-91=а-5
181+b-195+x=b+x-6
x-16-y+24=х-у+8
13+65-11-54=11
а+86-91=а-5. 181+b-(195-x)=181+b-195+x=x+b-6. x-16-(y-24)=x-16-y+24=x-y+8. 13+65-(11+54)=78-65=13
a+86-91=а-5
181+b-195+x=b+x-6
x-16-y+24=х-у+8
13+65-11-54=11
а+86-91=а-5. 181+b-(195-x)=181+b-195+x=x+b-6. x-16-(y-24)=x-16-y+24=x-y+8. 13+65-(11+54)=78-65=13