30-5a=7a=42

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Solution for 30-5a=7a=42 equation: 



30-5a=7a=42

We move all terms to the left:

30-5a-(7a)=0

We add all the numbers together, and all the variables

-12a+30=0

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

-12a=-30

a=-30/-12

a=2+1/2

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