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16=3x-21
We move all terms to the left:
16-(3x-21)=0
We get rid of parentheses
-3x+21+16=0
We add all the numbers together, and all the variables
-3x+37=0
We move all terms containing x to the left, all other terms to the right
-3x=-37
x=-37/-3
x=12+1/3
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