1) 86+x+138=250 2) 250 - (175-Y) = 125 3) (x-84) * 11=176 4) 723 - (246+x) = 123

1) 86 + x + 138 = 250;

x + 224 = 250;

Отделим значения х от чисел.

x = 250 - 224;

x = 36.

2) 250 - (175 - Y) = 125;

250 - 175 + y = 125;

y + 75 = 125;

y = 125 - 75;

y = 50.

3) (x - 84) * 11 = 176;

x - 84 = 176/11;

x - 84 = 16;

x = 16 + 84;

x = 100.

4) 723 - (246 + x) = 123;

723 - 246 - x = 123;

x = 723 - 246 - 123;

x = 354.