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42+(4x+16)=90
We move all terms to the left:
42+(4x+16)-(90)=0
We add all the numbers together, and all the variables
(4x+16)-48=0
We get rid of parentheses
4x+16-48=0
We add all the numbers together, and all the variables
4x-32=0
We move all terms containing x to the left, all other terms to the right
4x=32
x=32/4
x=8
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