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129+(x+19)=180
We move all terms to the left:
129+(x+19)-(180)=0
We add all the numbers together, and all the variables
(x+19)-51=0
We get rid of parentheses
x+19-51=0
We add all the numbers together, and all the variables
x-32=0
We move all terms containing x to the left, all other terms to the right
x=32
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