Is it, a solution or, NOT a solution?

Answer:
Perosnally i think it is not a solution but let me check that for you!
Step-by-step explanation:
Answer:Answer x=15 and the answer for x=6 will be false!
Step-by-step explanation:X=6 is not a solution but the correct answer is 15 .First we know that 5+5=10,then if we add 10+5 that will give us 15.