Odpowiedź :
1)5x + 7 = 22
5x = 15|:5
x = 3
2) 5 x = 3x + 12
2x = 12|:2
x = 6
3) 5x - 5 = 4x + 7
x = 12
4) 2(x+4)=x - 7
2x + 8 = x - 7
x = - 15
5) 9x - 8x - (16+2x) = 5(2-x)
x - 16 - 2x = 10 - 5x
-x + 5x = 10 + 16
4x = 26|:4
x = 6,5
1)5x + 7 = 22
5x = 15|:5
x = 3
2) 5 x = 3x + 12
2x = 12|:2
x = 6
3) 5x - 5 = 4x + 7
x = 12
4) 2(x+4)=x - 7
2x + 8 = x - 7
x = - 15
5) 9x - 8x - (16+2x) = 5(2-x)
x - 16 - 2x = 10 - 5x
-x + 5x = 10 + 16
4x = 26|:4
x = 6,5