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28+17x=16+21x
We move all terms to the left:
28+17x-(16+21x)=0
We add all the numbers together, and all the variables
17x-(21x+16)+28=0
We get rid of parentheses
17x-21x-16+28=0
We add all the numbers together, and all the variables
-4x+12=0
We move all terms containing x to the left, all other terms to the right
-4x=-12
x=-12/-4
x=+3
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