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12x-48=42-18x
We move all terms to the left:
12x-48-(42-18x)=0
We add all the numbers together, and all the variables
12x-(-18x+42)-48=0
We get rid of parentheses
12x+18x-42-48=0
We add all the numbers together, and all the variables
30x-90=0
We move all terms containing x to the left, all other terms to the right
30x=90
x=90/30
x=3
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