Respuesta :
Answer:
Start by laying out 7 tiles, and then adding 3. Whatever that number of tiles is equals x.
x = 10
10 - 3 = 7
answer: x=10
explanation: switch subtraction to addition to both sides and add 3 to both sides making it 7 + 3 witch equals 10
explanation: switch subtraction to addition to both sides and add 3 to both sides making it 7 + 3 witch equals 10
