7a-4a=30

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Solution for 7a-4a=30 equation: 



7a-4a=30

We move all terms to the left:

7a-4a-(30)=0

We add all the numbers together, and all the variables

3a-30=0

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

3a=30

a=30/3

a=10

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