Question

Resuelves 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 + 3 - 3 = 7 - 3
x + 0 = 4
x = 4

2) 9 + x = 12
-9 + 9 + x = 12 - 9
0 + x = 3
x = 3

3) 2x = 19 - 5
2x = 14
x = 14/2
x = 7

4) x - 8 = 12
x - 8 + 8 = 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 - 21 + 21 = 86 + 21
x = 107

8) x + 2 - 1 = 7
x + 1 = 7
x + 1 - 1 = 7 - 1
x = 6