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6(7+3x)=168
We move all terms to the left:
6(7+3x)-(168)=0
We add all the numbers together, and all the variables
6(3x+7)-168=0
We multiply parentheses
18x+42-168=0
We add all the numbers together, and all the variables
18x-126=0
We move all terms containing x to the left, all other terms to the right
18x=126
x=126/18
x=7
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