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x+(x-14)=90
We move all terms to the left:
x+(x-14)-(90)=0
We get rid of parentheses
x+x-14-90=0
We add all the numbers together, and all the variables
2x-104=0
We move all terms containing x to the left, all other terms to the right
2x=104
x=104/2
x=52
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