6-4a=42

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Solution for 6-4a=42 equation: 



6-4a=42

We move all terms to the left:

6-4a-(42)=0

We add all the numbers together, and all the variables

-4a-36=0

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

-4a=36

a=36/-4

a=-9

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