3a-9=42

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Solution for 3a-9=42 equation:



3a-9=42
We move all terms to the left:
3a-9-(42)=0
We add all the numbers together, and all the variables
3a-51=0
We move all terms containing a to the left, all other terms to the right
3a=51
a=51/3
a=17

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