Решите уравнения 2x-3=5+4x 4y+7=y-8 5-3x=2x-5 1-9c=2c+15 7+2x=9-4x 9x-12=9-4x

Решаем линейные уравнения с одной переменной.

1) 2x - 3 = 5 + 4x;

2x - 4x = 5 + 3;

-2x = 8;

x = 8 : (-2);

x = - 4.

2) 4y + 7 = y - 8;

4y - y = - 8 - 7;

y (4 - 1) = - 15;

3y = - 15;

y = - 15 : 3;

y = - 5.

3) 5 - 3x = 2x - 5;

-3x - 2x = - 5 - 5;

x (-3 - 2) = - 10;

-5x = - 10;

x = - 10 : (-5);

x = 2.

4) 1 - 9c = 2c + 15;

-9c - 2c = 15 - 1;

c (-9 - 2) = 14;

-11c = 14;

c = 14 : (-11);

c = - 1 3/11;

5) 7 + 2x = 9 - 4x;

2x + 4x = 9 - 7;

6x = 2;

x = 1/3;

6) 9x - 12 = 9 - 4x;

9x + 4x = 9 + 12;

13x = 21;

x = 21 : 13;

x = 1 8/13.