18+4a=42

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Solution for 18+4a=42 equation: 



18+4a=42

We move all terms to the left:

18+4a-(42)=0

We add all the numbers together, and all the variables

4a-24=0

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

4a=24

a=24/4

a=6

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