Решите уравнения: а) 0,3х + 8 = 2 б) 4

а) 0,3x + 8 = 2;

0.3x = 2 - 8;

0.3x = -6;

x = -6 : 0.3;

x = -20.

б)  4 x = 1 + 4x;

-x - 4x = 1 - 4;

x(-1 - 4) = -3;

-5x = -3;

x = -3 : (-5);

x = 0.6;

в) 7 - 2(x + 3) = 9 6x;

7 - 2 * x - 2 * 3 = 9 - 6x;

7 - 2x - 6 = 9 - 6x;

-2x + 6x = 9 + 6 - 7;

x(-2 + 6) = 8;

4x = 8;

x = 8 : 4;

x = 2;

г) 4(x - 0,5) 2(x + 0,3) = -2,6;

4 * x - 4 * 0.5 - 2 * x - 2 * 0.3 = -2.6;

4x - 2 - 2x - 0.6 = -2.6;

4x - 2x = -2.6 + 2 + 0.6;

x(4 - 2) = -2.6 + 2.6;

2x = 0;

x = 0.

д) 0,3(4x - 1) + 2,3 = 1,1x 27;

0.3 * 4x - 0.3 * 1 + 2.3 = 1.1x - 27;

1.2x - 0.3 + 2.3 = 1.1x - 27;

1.2x - 1.1x = -27 + 0.3 - 2.3;

0.1x = -29;

x = -290.