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-4u+8=6u-42
We move all terms to the left:
-4u+8-(6u-42)=0
We get rid of parentheses
-4u-6u+42+8=0
We add all the numbers together, and all the variables
-10u+50=0
We move all terms containing u to the left, all other terms to the right
-10u=-50
u=-50/-10
u=+5
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