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47+(x-8)=90
We move all terms to the left:
47+(x-8)-(90)=0
We add all the numbers together, and all the variables
(x-8)-43=0
We get rid of parentheses
x-8-43=0
We add all the numbers together, and all the variables
x-51=0
We move all terms containing x to the left, all other terms to the right
x=51
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