3a-7=140

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Solution for 3a-7=140 equation: 



3a-7=140

We move all terms to the left:

3a-7-(140)=0

We add all the numbers together, and all the variables

3a-147=0

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

3a=147

a=147/3

a=49

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