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4u-28=-4u+4
We move all terms to the left:
4u-28-(-4u+4)=0
We get rid of parentheses
4u+4u-4-28=0
We add all the numbers together, and all the variables
8u-32=0
We move all terms containing u to the left, all other terms to the right
8u=32
u=32/8
u=4
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