4a-100=42

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Solution for 4a-100=42 equation: 



4a-100=42

We move all terms to the left:

4a-100-(42)=0

We add all the numbers together, and all the variables

4a-142=0

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

4a=142

a=142/4

a=35+1/2

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