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-8u+31=-3(u-2)
We move all terms to the left:
-8u+31-(-3(u-2))=0
We calculate terms in parentheses: -(-3(u-2)), so:We get rid of parentheses
-3(u-2)
We multiply parentheses
-3u+6
Back to the equation:
-(-3u+6)
-8u+3u-6+31=0
We add all the numbers together, and all the variables
-5u+25=0
We move all terms containing u to the left, all other terms to the right
-5u=-25
u=-25/-5
u=+5
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