3. 5х + 18 = 7х + 6(3х – 7)
5x + 18 = 7x + 18x – 42
5x – 7x – 18x = – 42 – 18
-20x = -60
x = 3
4. 3х – 7(3х – 4) = 5(2х – 7)
3x – 21x + 28 = 10x – 35
3x – 21x – 10x = – 35 – 28
-28x = -63
x = 2.25
5. 13 – 3(5х + 1) – 6(4х – 3) = 5х
13 – 15x – 3 – 24x + 18 = 5x
– 15x – 24x – 5x = – 18 + 3 – 13
-44x = -28
-11x = -7
x = -7/-11
х=0,63636363636
6. 4(x + 2) – 0,7 = 2(2x + 4) + 0,3
4x + 8 – 0.7 = 4x + 8 + 0.3
4x – 4x = 0,3 + 8 + 0,7 – 8
0x = 1
уравнение решений не имеет
3. 5х + 18 = 7х + 6(3х – 7)
5x + 18 = 7x + 18x – 42
5x – 7x – 18x = – 42 – 18
-20x = -60
x = 3
4. 3х – 7(3х – 4) = 5(2х – 7)
3x – 21x + 28 = 10x – 35
3x – 21x – 10x = – 35 – 28
-28x = -63
x = 2.25
5. 13 – 3(5х + 1) – 6(4х – 3) = 5х
13 – 15x – 3 – 24x + 18 = 5x
– 15x – 24x – 5x = – 18 + 3 – 13
-44x = -28
-11x = -7
x = -7/-11
х=0,63636363636
6. 4(x + 2) – 0,7 = 2(2x + 4) + 0,3
4x + 8 – 0.7 = 4x + 8 + 0.3
4x – 4x = 0,3 + 8 + 0,7 – 8
0x = 1
уравнение решений не имеет