13+65-11+54=13+54+54=121;
a+84-91=а-7;
181+b-195-x=b-14-х;
x-16-y-24=х-у-40
(13+65)-(11+54)
(а+84)-91
(181+b)-(195-x)
(x-16)-(y-24)
13+65-11+54=13+54+54=121;
a+84-91=а-7;
181+b-195-x=b-14-х;
x-16-y-24=х-у-40
(13+65)-(11+54)
(а+84)-91
(181+b)-(195-x)
(x-16)-(y-24)