Respuesta :
[tex]~~~~~~2(x-12)+x=36\\\\\implies 2x-24+x = 36\\\\\implies 3x = 36+24\\\\\implies 3x = 60\\\\\implies x = \dfrac{60}3\\\\\implies x = 20[/tex]
2(x+12)+x=36
or,2x+24+x=36
or,3x+24=36
or,3x=36-24
or,3x=12
or,x=12/3
or,x=4
Thus, 20 is your answer