1) 4x = 20
2) 7x = – 14
3) – 3x = 9
4) – 7x = –14
5) 3x – 1 = 8
6) – x + 2 = 51
7) – 2x + 4 = –5
8) 6x – 1 = 9
9) 5x + 7 = 2x +13
10) 4x – 5 = 5x –1
11) 2x + 3 = 9 – x
12) 4x + 11 = 7x +
Soluções para a tarefa
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1) 4x = 20
x= 20/4
x= 5
2) 7x = – 14
x= - 14/7
x= - 2
3) – 3x = 9
x= 9/-3
x= - 3
4) – 7x = –14
x= - 14/-7
x= 2
5) 3x – 1 = 8
3x= 8 + 1
3x= 9
x= 9/3
x= 3
6) – x + 2 = 51
- x= 51 - 2
- x= 49 (-1)
x= - 49
7) – 2x + 4 = –5
- 2x= - 5 - 4
- 2x= - 9
x= - 9/-2(- 1)
x= 9/2
8) 6x – 1 = 9
6x= 9 + 1
6x= 10
x= 10/6 (÷2)
x= 5/3
9) 5x + 7 = 2x +13
5x - 2x = 13 - 7
3x= 6
x= 6/3
x= 2
10) 4x – 5 = 5x –1
4x - 5x = - 1 + 5
- x= 4 (-1)
x= - 4
11) 2x + 3 = 9 – x
2x + x = 9 - 3
3x = 6
x= 6/3
x= 2
12) 4x + 11 = 7x
4x - 7x= - 11
- 3x = - 11
x= - 11/-3 (-1)
x= 11/3
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