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