Verified Answer :

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x/3+10=15
     -10   -10
x/3= 5
x= 3*5
x=15

check by substitution 15/3 +10= 15
                                  5+10=15, this is true 
Therefore x=15 is the answer

\(\frac{x}{3}+10=15 \hbox{ /|10 (substract 10 from both) }\)

\(\frac{x}{3}=15-10=5\) ⇒ \(x=3*5\)

\(\boxed {x=15}\)