Odpowiedź :
1)
2x + 6 = 4x - 4
2x - 4x = - 4 - 6
- 2x = - 10 / : (-2)
x = 5
2)
2(x - 3) - 3(x + 1) = x - 13
2x - 6 - 3x - 3 = x - 13
2x - 3x - x = -13 + 6 + 3
- 2x = - 4 / : (-2)
x = 2
2x + 6 = 4x - 4 // -2x
6 = 2x -4 // +4
10 = 2x // :2
5 = x
2(x-3) -3(x+1)=x-13
2x - 6 - 3x - 3 = x - 13
-x - 9 = x - 13 // +x
-9 = 2x - 13 // +13
4 = 2x // :2
2 = x