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30x=2x+168
We move all terms to the left:
30x-(2x+168)=0
We get rid of parentheses
30x-2x-168=0
We add all the numbers together, and all the variables
28x-168=0
We move all terms containing x to the left, all other terms to the right
28x=168
x=168/28
x=6
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