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5x+9=x+129
We move all terms to the left:
5x+9-(x+129)=0
We get rid of parentheses
5x-x-129+9=0
We add all the numbers together, and all the variables
4x-120=0
We move all terms containing x to the left, all other terms to the right
4x=120
x=120/4
x=30
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