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(x+45)+(x+56)+(81)=180
We move all terms to the left:
(x+45)+(x+56)+(81)-(180)=0
We add all the numbers together, and all the variables
(x+45)+(x+56)-99=0
We get rid of parentheses
x+x+45+56-99=0
We add all the numbers together, and all the variables
2x+2=0
We move all terms containing x to the left, all other terms to the right
2x=-2
x=-2/2
x=-1
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