250+9*a=520

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Solution for 250+9*a=520 equation: 



250+9a=520

We move all terms to the left:

250+9a-(520)=0

We add all the numbers together, and all the variables

9a-270=0

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

9a=270

a=270/9

a=30

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