Решите Уравнения х+х+86=128 2х+5х+49=287 (х+20)*10=700 8*(36+х)=1288 (х-65)*5=400 (х-84)*11=176

Найдем корешки. 

1) х + х + 86 = 128; 

2 * x + 86 = 128;

2 * x = 128 - 86;

2 * x  = 42;

x = 42/2;

x = 21.

2) 2  * х + 5 * х + 49 = 287; 

7 * x + 49 = 287;

7 * x = 287 - 49;

7 * x = 238;

x = 238/7;

x = 34.

3) (х + 20) * 10 = 700; 

x + 20 = 700/10;

x  + 20 = 70;

x = 70 - 20;

x = 50.

4) 8 * (36 + х) = 1 288; 

x + 36 = 1 288/8;

x + 36 = 161;

x = 161 - 36;

x = 125.

5) (х - 65) * 5 = 400; 

x - 65 = 400/5;

x - 65 = 80;

x = 80 + 65;

x = 145.

6) (х - 84) * 11 = 176; 

x - 84 = 176/11; 

x - 84 = 16; 

x = 16 + 84; 

x = 100.