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Ajutor.. e urgent..

Ajutor E Urgent class=

Răspuns :

3x+1=4
3x=4-1=3
3x=3
x=3:3
x=1

5k-7=-2
5k=-2+7=5
5k=5
k=5:5
k=1

x-3=3x-1 ???
| 3x+1|=4
3x+1=4|-1
3x=3|:3
X=3
|5x-7|=-2
5x-7=2|+7
5x=9|:5
X=9 pe 5
| X-3|=|3x+1|
X-3=3x+1|+3x
4x-3=1|+3
4x=4|:4
X=1