Bonjour
1) -2×+7=-×+9
- 2x + x = 9 - 7
- x = 2
x = - 2
2) 4×-21=7×-9
4x - 7x = - 9 + 21
- 3x = 12
x = - 12/3
x = - 4
3) -7×-12=8×+3
- 7x - 8x = 3 + 12
- 15x= 15
x = - 15/15
x = - 1
4) 7×+13=-3×-7
7x + 3x = - 7 - 13
10x = - 20
x = - 20/10
x = - 2.
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Bonjour
1) -2×+7=-×+9
- 2x + x = 9 - 7
- x = 2
x = - 2
2) 4×-21=7×-9
4x - 7x = - 9 + 21
- 3x = 12
x = - 12/3
x = - 4
3) -7×-12=8×+3
- 7x - 8x = 3 + 12
- 15x= 15
x = - 15/15
x = - 1
4) 7×+13=-3×-7
7x + 3x = - 7 - 13
10x = - 20
x = - 20/10
x = - 2.