Methods:
[tex]3x-2=13 [/tex]
=> [tex]3x-2+2=13+2[/tex]
=> [tex]3x+0=15[/tex]
=> [tex]3x=15[/tex]
=> [tex] \frac{3}{3}x= \frac{15}{3} [/tex]
=> [tex]x = \frac{5}{1} [/tex] or [tex]5[/tex]
or, (do side changing)
[tex]3x-2=13 [/tex]
=> [tex]3x=13+2[/tex]
=> [tex]3x=15[/tex]
=> [tex]x= \frac{15}{3} [/tex]
=> [tex]x= \frac{5}{1} [/tex] or [tex]5[/tex]
