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(x+2)+(x-4)=90
We move all terms to the left:
(x+2)+(x-4)-(90)=0
We get rid of parentheses
x+x+2-4-90=0
We add all the numbers together, and all the variables
2x-92=0
We move all terms containing x to the left, all other terms to the right
2x=92
x=92/2
x=46
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