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(x+8)=2x=90
We move all terms to the left:
(x+8)-(2x)=0
We add all the numbers together, and all the variables
-2x+(x+8)=0
We get rid of parentheses
-2x+x+8=0
We add all the numbers together, and all the variables
-1x+8=0
We move all terms containing x to the left, all other terms to the right
-x=-8
x=-8/-1
x=+8
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