[tex]4 \times x \: \: e \: \: 4 \times 2[/tex]
[tex]4x + 8 - 2(x - 2) = 30[/tex]
[tex] - 2 \times x = - 2x[/tex]
[tex] - 2 \times (- 2) = + 4[/tex]
[tex]4x + 8 - 2x + 4 = 30[/tex]
[tex]4x - 2x = 30 - 8 - 4[/tex]
[tex]2x = 30 - 12[/tex]
[tex]2x = 18[/tex]
[tex]x = \frac{18}{2} [/tex]
[tex]x = 9[/tex]
[tex]4(9 + 2) - 2(9 - 2) = 30[/tex]
[tex]44 - 14 = 30[/tex]
[tex]30 = 30[/tex]
