Решите уравнение: x+x+86=178 2x+5x+49=287 (x+20)*10=700 8*(36+x)=1288 (x-65)*5=400

Вычислим корешки уравнений.

1) x + x + 86 = 178; 

x + x = 178 - 86;

x + x = 20 + 70 + 2;

x + x = 92;

x * (1 + 1) = 92;

x * 2 = 92;

x = 92/2;

x = 46.

2) 2 * x + 5 * x + 49 = 287; 

7 * x + 49 = 287;

7 * x = 287 - 49;

7 * x = 240 - 2;

7 * x = 238;

x = 238/7; 

x  = 34. 

3) (x + 20) * 10 = 700; 

x + 20 = 700/10;

x + 20 = 70;

x = 70 - 20;

x = 50.

4) 8 * (36 + x) = 1 288; 

x + 36 = 1 288/8;

x + 36 = 161;

x = 161 - 36;

x = 130 - 5;

x = 125.

5) (x - 65) * 5 = 400; 

x - 65 = 400/5; 

x - 65 = 80; 

x = 80 + 65; 

x = 145.