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6(4x+9)=126
We move all terms to the left:
6(4x+9)-(126)=0
We multiply parentheses
24x+54-126=0
We add all the numbers together, and all the variables
24x-72=0
We move all terms containing x to the left, all other terms to the right
24x=72
x=72/24
x=3
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