Olá...
a)
x + 5 = 15
x = 15 - 5
x = 10
b)
2x - 1 = 6
2x = 6 + 1
2x = 7
x = 7/2
c)
3x + 1 = 5x + 7
3x - 5x = 7 - 1
- 2x = 6 ( - 1)
2x = - 6
x = - 6/2
x = - 3
d)
4x + 5 = 15 + 2x
4x - 2x = 15 - 5
2x = 10
x = 10/2
x = 5
e)
5x - 1 = 9
5x = 9 + 1
5x = 10
x = 10/5
x = 2
f)
20 + x = 20
x = 20 - 20
x = 0
g)
15 = 3x - 12
- 3x = -12 - 15
- 3x = - 27 (- 1)
3x = 27
x = 27/3
x = 9
h)
8x - 3 = 10x
8x - 10x = 3
- 2x = 3 (- 1)
2x = - 3
x = - 3/2
i)
10x - 9 - 4x = 0
6x = 9
x = 9/6 ÷ 3
x = 3/2
Espero ter ajudado
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Olá...
a)
x + 5 = 15
x = 15 - 5
x = 10
b)
2x - 1 = 6
2x = 6 + 1
2x = 7
x = 7/2
c)
3x + 1 = 5x + 7
3x - 5x = 7 - 1
- 2x = 6 ( - 1)
2x = - 6
x = - 6/2
x = - 3
d)
4x + 5 = 15 + 2x
4x - 2x = 15 - 5
2x = 10
x = 10/2
x = 5
e)
5x - 1 = 9
5x = 9 + 1
5x = 10
x = 10/5
x = 2
f)
20 + x = 20
x = 20 - 20
x = 0
g)
15 = 3x - 12
- 3x = -12 - 15
- 3x = - 27 (- 1)
3x = 27
x = 27/3
x = 9
h)
8x - 3 = 10x
8x - 10x = 3
- 2x = 3 (- 1)
2x = - 3
x = - 3/2
i)
10x - 9 - 4x = 0
6x = 9
x = 9/6 ÷ 3
x = 3/2
Espero ter ajudado