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3+16x=20x+21
We move all terms to the left:
3+16x-(20x+21)=0
We get rid of parentheses
16x-20x-21+3=0
We add all the numbers together, and all the variables
-4x-18=0
We move all terms containing x to the left, all other terms to the right
-4x=18
x=18/-4
x=-4+1/2
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