2x +6 = x +15

i need help on how to slove this my teacher confused me and i was afraid to ask him again so i need your help to give me the answer but can you explain it to me and do step by step and i have to show work so can you show work too please. i appreaciated.
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1 Answer

2x + 6 = x + 15
x + 6 = 15 {subtracted x from both sides}
x = 9 {subtracted 6 from both sides}
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by Level 4 User (8.4k points)

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