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2(9x+42)=21x+18
We move all terms to the left:
2(9x+42)-(21x+18)=0
We multiply parentheses
18x-(21x+18)+84=0
We get rid of parentheses
18x-21x-18+84=0
We add all the numbers together, and all the variables
-3x+66=0
We move all terms containing x to the left, all other terms to the right
-3x=-66
x=-66/-3
x=+22
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