222 - (360:y+43) = 99 8000: (28x+4) - 15=25 (410-x) : 7+70=120

1) 222 - (360 : j + 43) = 99;

222 - 99 = 360 : j + 43;

123 = 360 : j + 43;

123 - 43 = 360 : j;

80 = 360 : j;

80 у = 360;

j = 360 : 80;

j = 4,5.

Ответ: j = 4,5.

2) 8000 : (28w + 4) - 15 = 25;

8000 : (28w + 4) = 25 + 15;

8000 : (28w + 4) = 40;

8000 = 40 * (28w + 4);

8000 : 40 = 28w + 4;

200 = 28w + 4;

200 - 4 = 28w;

196 = 28w;

w = 196 : 28;

w = 7.

Ответ: w = 7.

3) (410 - w) : 7 + 70 = 120;

(410 - w) : 7 = 120 - 70;

(410 - w) : 7 = 50;

410 - w = 50 * 7;

410 - w = 350;

410 - 350 = w;

w = 60.

Ответ: w = 60.