а) х + 1 105 = 1 015;
x = 1 015 - 1 105;
x = 15 - 105;
x = 10 - 100;
x = -90.
б) 5 = 8 - 3 * х;
3 * x = 8 - 5;
3 * x = 3;
x = 3/3;
x = 1.
в) 6 * х + 7 = 3 - 2 * х;
6 * x + 2 * x = 3 - 7;
x * (6 + 2) = -4;
x * 8 = -4;
8 * x = -4;
x = -4/8;
x = -1/2;
x = -0.5.
г) 5 * (а - 7) - 3 * (а - 4) = -13;
5 * a - 5 * 7 - 3 * a + 3 * 4 = -13;
5 * a - 35 - 3 * a + 12 = -13;
2 * a - 35 + 12 = -13;
2 * a - 23 = -13;
2 * a = -13 + 23;
2 * a = 10;
a = 10/2;
a = 5.
а) х + 1 105 = 1 015;
x = 1 015 - 1 105;
x = 15 - 105;
x = 10 - 100;
x = -90.
б) 5 = 8 - 3 * х;
3 * x = 8 - 5;
3 * x = 3;
x = 3/3;
x = 1.
в) 6 * х + 7 = 3 - 2 * х;
6 * x + 2 * x = 3 - 7;
x * (6 + 2) = -4;
x * 8 = -4;
8 * x = -4;
x = -4/8;
x = -1/2;
x = -0.5.
г) 5 * (а - 7) - 3 * (а - 4) = -13;
5 * a - 5 * 7 - 3 * a + 3 * 4 = -13;
5 * a - 35 - 3 * a + 12 = -13;
2 * a - 35 + 12 = -13;
2 * a - 23 = -13;
2 * a = -13 + 23;
2 * a = 10;
a = 10/2;
a = 5.