Question

Przykład

-2x - 7 = 2x - 7 /+2x
-7 = 4x - 7 /+7
0 = 4 /: 4
o = x

zadania
1) 2x + 7 = 13
2) 9x + 10 = 4x + 25
3) 11x + 10 = 2x + 37
4) 12x + 6 = 9x + 12
5) 5x - 12 = 4 + 4x
6) 9x - 8 = 3x + 2
7) 10x - 4 = 5x + 8
8) 2x - 2 = -12x + 18
9) -5x + 4 = x-8
10) -7x + 5 = 11x + 41

Answer 1

1) 2x + 7 = 13 | -7
2x=6|:2
x=3

2) 9x + 10 = 4x + 25 |-10-4x
5x=15|:5
x=3

3) 11x + 10 = 2x + 37 |-2x-10
9x=27|:9
x=3

4) 12x + 6 = 9x + 12|-6-9x
3x=6|:3
x=2

5) 5x - 12 = 4 + 4x |+12-4x
x=16

6) 9x - 8 = 3x + 2 |+8-3x
6x=10/:6
x=1⅔

7) 10x - 4 = 5x + 8 |+4-5x
5x=12|:5
x=2⅖

8) 2x - 2 = -12x + 18|+2+12x
14x=20|:14
x=1 i 3/7

9) -5x + 4 = x-8 |-4-x
-6x=-12 |:(-6)
x=2

10) -7x + 5 = 11x + 41|-5-11
-16x=36|:(-16)
x=2¼

Answer 2

1) 2x + 7 = 13
2x=13-7
2x=6/:2
x=3

2) 9x + 10 = 4x + 25
9x-4x=25-10
5x=15/:5
x=3

3) 11x + 10 = 2x + 37
11x-2x=37-10
9x=27/:9
x=3

4) 12x + 6 = 9x + 12
12x-9x=12-6
3x=6/:3
x=2

5) 5x - 12 = 4 + 4x
5x-4x=4+12
x=16

6) 9x - 8 = 3x + 2
9x-3x=2+8
6x=10/:6
x=10/6

7) 10x - 4 = 5x + 8
10x-5x=8+4
5x=12/:5
x=2,4

8) 2x - 2 = -12x + 18
2x+12x=18+2
14x=20/:14
x=1,42

9) -5x + 4 = x-8
8-4=5x-x
4=4x/:4
1=x

10) -7x + 5 = 11x + 41
-7x-11x=41-5
-18x=36/:18
-x=2/*(-1)
x=-2