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6x+3(6x-5)=129
We move all terms to the left:
6x+3(6x-5)-(129)=0
We multiply parentheses
6x+18x-15-129=0
We add all the numbers together, and all the variables
24x-144=0
We move all terms containing x to the left, all other terms to the right
24x=144
x=144/24
x=6
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