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3x+18(x=6)
We move all terms to the left:
3x+18(x-(6))=0
We multiply parentheses
3x+18x-108=0
We add all the numbers together, and all the variables
21x-108=0
We move all terms containing x to the left, all other terms to the right
21x=108
x=108/21
x=5+1/7
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