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2=-2(u+9)+8
We move all terms to the left:
2-(-2(u+9)+8)=0
We calculate terms in parentheses: -(-2(u+9)+8), so:We get rid of parentheses
-2(u+9)+8
We multiply parentheses
-2u-18+8
We add all the numbers together, and all the variables
-2u-10
Back to the equation:
-(-2u-10)
2u+10+2=0
We add all the numbers together, and all the variables
2u+12=0
We move all terms containing u to the left, all other terms to the right
2u=-12
u=-12/2
u=-6
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