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(x+9)+(x-44)=90
We move all terms to the left:
(x+9)+(x-44)-(90)=0
We get rid of parentheses
x+x+9-44-90=0
We add all the numbers together, and all the variables
2x-125=0
We move all terms containing x to the left, all other terms to the right
2x=125
x=125/2
x=62+1/2
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