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x-(90-x)=46
We move all terms to the left:
x-(90-x)-(46)=0
We add all the numbers together, and all the variables
x-(-1x+90)-46=0
We get rid of parentheses
x+1x-90-46=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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