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84+(x-6)=90
We move all terms to the left:
84+(x-6)-(90)=0
We add all the numbers together, and all the variables
(x-6)-6=0
We get rid of parentheses
x-6-6=0
We add all the numbers together, and all the variables
x-12=0
We move all terms containing x to the left, all other terms to the right
x=12
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