a+a=7+3

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Solution for a+a=7+3 equation: 



a+a=7+3

We move all terms to the left:

a+a-(7+3)=0

We add all the numbers together, and all the variables

a+a-10=0

We add all the numbers together, and all the variables

2a-10=0

We move all terms containing a to the left, all other terms to the right

2a=10

a=10/2

a=5

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