Odpowiedź :
[tex]2x+4=8\\2x=8-4\\2x=4\ |:2\\x=2\\\\5x=15\ |:5\\x=3\\\\4+x=28\\x=28-4\\x=24\\\\4x-8=30\\4x=30+8\\4x=38\ |:4\\x=\frac{38}{4}\\x=9\frac{1}{2}\\\\4x=\frac{1}{12}\ |:4\\x=\frac{1}{12}*\frac{1}{4}\\x=\frac{1}{48}[/tex]
2x+4=8
2x=8-4=4
x=4:2=2
5x=15
x=15:5=3
4+x=28
x=28-4=24
4x-8=30
4x=30+8=38
x=38:4=9,5
4x=1/12
x=1/12:4=1/48
Pozdrawiam serdecznie