Answer:
[tex]\huge \boxed{x=12}[/tex]
Step-by-step explanation:
Let the unknown number be x.
12+24=2(6+x)
Switch sides.
2(6+x)=12+24
Expand brackets.
12+2x=12+24
Subtract 12 from both sides of the equation.
12+2x-12=12+24-12
2x=24
Divide both sides of the equation by 2.
(2x)/2=24/2
x=12
12+24=2(6+x )
36=2(6+ )
36\2=(6+x)
18=(6+x)
18-6=x
12=x
the answer is 12
