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16x+20=21x+8x
We move all terms to the left:
16x+20-(21x+8x)=0
We add all the numbers together, and all the variables
16x-(+29x)+20=0
We get rid of parentheses
16x-29x+20=0
We add all the numbers together, and all the variables
-13x+20=0
We move all terms containing x to the left, all other terms to the right
-13x=-20
x=-20/-13
x=1+7/13
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