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5x+2(3x-4)=9x+20
We move all terms to the left:
5x+2(3x-4)-(9x+20)=0
We multiply parentheses
5x+6x-(9x+20)-8=0
We get rid of parentheses
5x+6x-9x-20-8=0
We add all the numbers together, and all the variables
2x-28=0
We move all terms containing x to the left, all other terms to the right
2x=28
x=28/2
x=14
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