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4x-108=42+9x
We move all terms to the left:
4x-108-(42+9x)=0
We add all the numbers together, and all the variables
4x-(9x+42)-108=0
We get rid of parentheses
4x-9x-42-108=0
We add all the numbers together, and all the variables
-5x-150=0
We move all terms containing x to the left, all other terms to the right
-5x=150
x=150/-5
x=-30
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