Odpowiedź :
5x = 90 /:5
x = 18
5 + 6x = 23 /-5
6x = 18 /:6
x = 3
6x - 10 = 14 /+ 10
6x = 24 /: 6
x = 4
5x - 3 + 2x = 4x + 9 /+3
7x = 4x + 9 + 3 /-4x
3x = 12 /:3
x = 4
1) x=90:5
x=18
2) 6x=23-5
6x=18
x=18:6
x=3
3) 6x=14+10
6x=24
x=24:6
x=4
4) 5x+2x-4x=9+3
3x=12
x=12:3
x=4
x=18
2) 6x=23-5
6x=18
x=18:6
x=3
3) 6x=14+10
6x=24
x=24:6
x=4
4) 5x+2x-4x=9+3
3x=12
x=12:3
x=4