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(59+x)+(129+x)=180
We move all terms to the left:
(59+x)+(129+x)-(180)=0
We add all the numbers together, and all the variables
(x+59)+(x+129)-180=0
We get rid of parentheses
x+x+59+129-180=0
We add all the numbers together, and all the variables
2x+8=0
We move all terms containing x to the left, all other terms to the right
2x=-8
x=-8/2
x=-4
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