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28-21x=16x-12
We move all terms to the left:
28-21x-(16x-12)=0
We get rid of parentheses
-21x-16x+12+28=0
We add all the numbers together, and all the variables
-37x+40=0
We move all terms containing x to the left, all other terms to the right
-37x=-40
x=-40/-37
x=1+3/37
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