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2+x+(x+10)=90
We move all terms to the left:
2+x+(x+10)-(90)=0
We add all the numbers together, and all the variables
x+(x+10)-88=0
We get rid of parentheses
x+x+10-88=0
We add all the numbers together, and all the variables
2x-78=0
We move all terms containing x to the left, all other terms to the right
2x=78
x=78/2
x=39
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