a+a+a+a=40

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Solution for a+a+a+a=40 equation: 



a+a+a+a=40

We move all terms to the left:

a+a+a+a-(40)=0

We add all the numbers together, and all the variables

4a-40=0

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

4a=40

a=40/4

a=10

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