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28=4x-56
We move all terms to the left:
28-(4x-56)=0
We get rid of parentheses
-4x+56+28=0
We add all the numbers together, and all the variables
-4x+84=0
We move all terms containing x to the left, all other terms to the right
-4x=-84
x=-84/-4
x=+21
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