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16x+21=13x+0
We move all terms to the left:
16x+21-(13x+0)=0
We add all the numbers together, and all the variables
16x-(+13x)+21=0
We get rid of parentheses
16x-13x+21=0
We add all the numbers together, and all the variables
3x+21=0
We move all terms containing x to the left, all other terms to the right
3x=-21
x=-21/3
x=-7
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