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-5u=-4u+7
We move all terms to the left:
-5u-(-4u+7)=0
We get rid of parentheses
-5u+4u-7=0
We add all the numbers together, and all the variables
-1u-7=0
We move all terms containing u to the left, all other terms to the right
-u=7
u=7/-1
u=-7
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