Respuesta:
[tex]a) \: x + 12 = 9 \\ x = 9 - 12 \\ x = - 3[/tex]
[tex]b) \: 4 + x = - 6 \\ x + 4 = - 6 \\ x = - 6 - 4 \\ x = - 10[/tex]
[tex]c) \: 2x - 5 = 13 \\ 2x = 13 + 5 \\ 2x = 18 \\ x = 9[/tex]
[tex]d) \: 4x + 20 = x + 11 \\ 4 \times + 20 - x = 11 \\ 4x - x = 11 - 20 \\ 3x = 11 - 20 \\ 3x = - 9 \\ = - 3[/tex]
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Verified answer
Respuesta:
[tex]a) \: x + 12 = 9 \\ x = 9 - 12 \\ x = - 3[/tex]
[tex]b) \: 4 + x = - 6 \\ x + 4 = - 6 \\ x = - 6 - 4 \\ x = - 10[/tex]
[tex]c) \: 2x - 5 = 13 \\ 2x = 13 + 5 \\ 2x = 18 \\ x = 9[/tex]
[tex]d) \: 4x + 20 = x + 11 \\ 4 \times + 20 - x = 11 \\ 4x - x = 11 - 20 \\ 3x = 11 - 20 \\ 3x = - 9 \\ = - 3[/tex]