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x+(x-46)=90
We move all terms to the left:
x+(x-46)-(90)=0
We get rid of parentheses
x+x-46-90=0
We add all the numbers together, and all the variables
2x-136=0
We move all terms containing x to the left, all other terms to the right
2x=136
x=136/2
x=68
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