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(x+3)+43=90
We move all terms to the left:
(x+3)+43-(90)=0
We add all the numbers together, and all the variables
(x+3)-47=0
We get rid of parentheses
x+3-47=0
We add all the numbers together, and all the variables
x-44=0
We move all terms containing x to the left, all other terms to the right
x=44
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