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129+(2x+16)=180
We move all terms to the left:
129+(2x+16)-(180)=0
We add all the numbers together, and all the variables
(2x+16)-51=0
We get rid of parentheses
2x+16-51=0
We add all the numbers together, and all the variables
2x-35=0
We move all terms containing x to the left, all other terms to the right
2x=35
x=35/2
x=17+1/2
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