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(x+67)+(x+37)+90=180
We move all terms to the left:
(x+67)+(x+37)+90-(180)=0
We add all the numbers together, and all the variables
(x+67)+(x+37)-90=0
We get rid of parentheses
x+x+67+37-90=0
We add all the numbers together, and all the variables
2x+14=0
We move all terms containing x to the left, all other terms to the right
2x=-14
x=-14/2
x=-7
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