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x=90-x-50
We move all terms to the left:
x-(90-x-50)=0
We add all the numbers together, and all the variables
x-(-1x+40)=0
We get rid of parentheses
x+1x-40=0
We add all the numbers together, and all the variables
2x-40=0
We move all terms containing x to the left, all other terms to the right
2x=40
x=40/2
x=20
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