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-3x+6(4x+14)=168
We move all terms to the left:
-3x+6(4x+14)-(168)=0
We multiply parentheses
-3x+24x+84-168=0
We add all the numbers together, and all the variables
21x-84=0
We move all terms containing x to the left, all other terms to the right
21x=84
x=84/21
x=4
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