7x = x + 10 |-x
8x = 10 |/8
x = 8/10 = 4/5
3x + 8 = 7x - 4 |+4
3x + 12 = 7x |-3x
4x = 12 |/4
x = 3
Odpowiedź:
[tex]7x=x+10\\\\7x-x=10\\\\6x=10\ \ |:6\\\\x=\frac{10}{6}\\\\x=1\frac{4}{6}\\\\x=1\frac{2}{3}\\\\\\3x+8=7x-4\\\\3x-7x=-4-8\\\\-4x=-12\ \ |:(-4)\\\\x=3[/tex]
