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21+28x=26+15x
We move all terms to the left:
21+28x-(26+15x)=0
We add all the numbers together, and all the variables
28x-(15x+26)+21=0
We get rid of parentheses
28x-15x-26+21=0
We add all the numbers together, and all the variables
13x-5=0
We move all terms containing x to the left, all other terms to the right
13x=5
x=5/13
x=5/13
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