Answer :

1/2 x + 3 = 9 /*2
x+6=18
x=18-6
x=12

[tex]\frac{1}{2}x+3=9/-3\\\\\frac{1}{2}x=6/:\frac{1}{2}\\\\x=12[/tex]
The answer is 12.

I hope I helped :D

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