Răspuns:
[tex]5x - 6 - 3( \times + 4) = (x - 5) - 7 \\ 5x - 6 - 3x - 12 = (x - 5) - 7 \\ 2x - 18 = (x - 5) - 7 \\ 2x - 18 - x + 5 + 7 = 0\\ x - 13 + 7 = 0\\ x - 6 = 0 \\ = > x = 6[/tex]
5x-6-3(x+4)=(x-5)-7
5x-6-3x-12=x-5-7
2x-18=x-12
2x-x=-12+18
x=6
