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6(2+7x)=138
We move all terms to the left:
6(2+7x)-(138)=0
We add all the numbers together, and all the variables
6(7x+2)-138=0
We multiply parentheses
42x+12-138=0
We add all the numbers together, and all the variables
42x-126=0
We move all terms containing x to the left, all other terms to the right
42x=126
x=126/42
x=3
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