Question

Resuelve las siguientes ecuaciones:
1. x + 3 = 7
2. 9 + x = 12
3. 2x = 19 - 5
4. x - 8 = 12
5. 5x = 20
6. 3x = 29 - 8
7. x - 21 = 86
8. (x + 2) - 1 = 7

Answer 1

1. x + 3 = 7

 x= 7-3

 x= 4

2. 9 + x = 12

 x= 12-9

 x= 3

3. 2x = 19 - 5

 2x= 14

 x=14/2

 x=7

4. x - 8 = 12

 x=12+8

 x=20

5. 5x = 20

 x=20/5

x=4

6. 3x = 29 - 8

 3x=21

 x=21/3

 x=7

7. x - 21 = 86

 x=86+21

 x=107

8. (x + 2) - 1 = 7

 x+2-1=7

 x=7-2+1

 x=6