450+a=920-40 y:6=9 8*b=32 X-340=180+20

450 + a = 920 - 40;

450 + а = 880;

а = 880 - 450;

а = 430;

450 + 430 = 920 - 40;

880 = 880;

y : 6 = 9;

у = 9 * 6;

у = 54;

54 : 6 = 9;

9 = 9;

8 * b = 32;

b = 32 : 8;

b = 4;

8 * 4 = 32;

32 = 32;

X - 340 = 180 + 20;

Х - 340 = 220;

Х = 220 + 340;

Х = 560;

560 - 340 = 180 + 20;

220 = 220.