Răspuns:
[tex]a)2x + 3 = - 13 \\ 2x = - 13 - 3 \\ 2x = - 16 \\ x = - \frac{16}{2} \\ x = - 8[/tex]
[tex]b)1 + 3x = 7 \\ 3x = 7 - 1 \\ 3x = 6 \\ x = \frac{6}{3} \\ x = 2[/tex]
[tex]c)5x - 6 = 4 \\ 5x = 10 \\ x = 2[/tex]
[tex]d)4x - 8 = - 2 \\ 4x = - 2 + 8 \\ 4x = 6 \\ x = \frac{3}{2} [/tex]
[tex]e)3x + ( - 9) = 0 \\ 3x = 9 \\ x = 3[/tex]
[tex]f)6x + ( - 5) = 7 \\ 6x = 12 \\ x = 2[/tex]
[tex]g)8x - ( - 3) = 13 \\ 8x + 3 = 13 \\ 8x = 13 - 3 \\ 8x = 10 \\ x = \frac{10}{8} \\ x = \frac{5}{4} [/tex]
[tex]h)( - 3) + 5x = 12 \\ 5x = 12 + 3 \\ 5x = 15 \\ x = 3[/tex]
[tex]i)4 - 2x = 6 \\ - 2x = 2 \\ x = \frac{2}{ - 2} \\ x = - 1[/tex]
[tex]j)( - 5) - 4x = - 13 \\ - 4x = - 8 \\ x = \frac{ - 8}{ - 4} \\ x = 2[/tex]
[tex]k)6 - 8x = - 10 \\ - 8x = - 16 \\ x = \frac{ - 16}{ - 8} \\ x = 2[/tex]
[tex]l)( - 2) - 3x = 7 \\ - 3x = 9 \\ x = - 3[/tex]
si la fiecare sa scrii ca x apartine de multimea Z
(x=-3 € Z)
