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6(7+3x)=258
We move all terms to the left:
6(7+3x)-(258)=0
We add all the numbers together, and all the variables
6(3x+7)-258=0
We multiply parentheses
18x+42-258=0
We add all the numbers together, and all the variables
18x-216=0
We move all terms containing x to the left, all other terms to the right
18x=216
x=216/18
x=12
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