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6x+2(6x+10)=146
We move all terms to the left:
6x+2(6x+10)-(146)=0
We multiply parentheses
6x+12x+20-146=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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