Odpowiedź:
1.
4a + 15 = -5
4a = -20
a = - 5
2.
3x + 2 = 2(x+1)
3x + 2 = 2x + 2
x = 0
3.
- 5x + 10 = - 2x - 8
-3x = - 18
x = - 6
4.
7x + 14 = 5x - 22
2x = - 36
x = - 18
5.
2(x - 3) + 3(4 - x) = 5
2x - 6 + 12 - 3x = 5
- x = -1
x = 1
6.
x + 2(3x - 4) = 53 + 2x
x + 6x - 8 = 53 + 2x
5x = 61
x = 12,2
7.
3x - 2 + 5x + 6 - x = 4x - 2 + 6x
-3x = - 6
x = 2
8.
- 5x + 10 = - 2x - 8
-3x = - 18
x = 6
9.
7x + 14 = 5x - 22
2x = - 36
x = - 18
10.
- 3 + 2x - 6 = 3 - 4x
6x = 12
x = 2
11.
-5x + 12 + x = 2x - 12
- 6x = - 24
x = 4
12.
2(x - 3) + 3(4- x) = 5
2x - 6 + 12 - 3x = 5
- x = - 1
x = 1
13.
2(x + 4) - 5(x + 3) = 2
2x + 8 - 5x - 15 = 2
- 3x = 9
x = - 9
14.
3(x - 4) - 2(2x - 5) = 4
3x - 12 - 4x + 10 = 4
- x = 6
x = - 6
15.
-2(x + 3) + 4(2x + 3) = - 6
-2x - 6 + 8x + 12 = - 6
6x = - 12
x = - 2
