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5x+3(4x-9)=126
We move all terms to the left:
5x+3(4x-9)-(126)=0
We multiply parentheses
5x+12x-27-126=0
We add all the numbers together, and all the variables
17x-153=0
We move all terms containing x to the left, all other terms to the right
17x=153
x=153/17
x=9
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