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x+(x+1)+(x+3)=-105
We move all terms to the left:
x+(x+1)+(x+3)-(-105)=0
We add all the numbers together, and all the variables
x+(x+1)+(x+3)+105=0
We get rid of parentheses
x+x+x+1+3+105=0
We add all the numbers together, and all the variables
3x+109=0
We move all terms containing x to the left, all other terms to the right
3x=-109
x=-109/3
x=-36+1/3
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