Hola amig@
Explicación paso a paso:
a)
[tex]x+12=30\\x=30-12\\x=18[/tex]
b)
[tex]x+9=27\\x=27-9\\x=18[/tex]
c)
[tex]5x=25\\x=\frac{25}{5}\\x=5[/tex]
d)
[tex]\frac{x}{4}=20\\x=20.4\\x=80[/tex]
e)
[tex]x+6-4=19\\x+2=19\\x=19-2\\x=17[/tex]
BYE
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Hola amig@
Explicación paso a paso:
a)
[tex]x+12=30\\x=30-12\\x=18[/tex]
b)
[tex]x+9=27\\x=27-9\\x=18[/tex]
c)
[tex]5x=25\\x=\frac{25}{5}\\x=5[/tex]
d)
[tex]\frac{x}{4}=20\\x=20.4\\x=80[/tex]
e)
[tex]x+6-4=19\\x+2=19\\x=19-2\\x=17[/tex]
BYE