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-3+8u=7+10u
We move all terms to the left:
-3+8u-(7+10u)=0
We add all the numbers together, and all the variables
8u-(10u+7)-3=0
We get rid of parentheses
8u-10u-7-3=0
We add all the numbers together, and all the variables
-2u-10=0
We move all terms containing u to the left, all other terms to the right
-2u=10
u=10/-2
u=-5
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