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6(8+3x)=138
We move all terms to the left:
6(8+3x)-(138)=0
We add all the numbers together, and all the variables
6(3x+8)-138=0
We multiply parentheses
18x+48-138=0
We add all the numbers together, and all the variables
18x-90=0
We move all terms containing x to the left, all other terms to the right
18x=90
x=90/18
x=5
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