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(3+x)*2=16
We move all terms to the left:
(3+x)*2-(16)=0
We add all the numbers together, and all the variables
(x+3)*2-16=0
We multiply parentheses
2x+6-16=0
We add all the numbers together, and all the variables
2x-10=0
We move all terms containing x to the left, all other terms to the right
2x=10
x=10/2
x=5
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