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-6u-30=-4(u+7)
We move all terms to the left:
-6u-30-(-4(u+7))=0
We calculate terms in parentheses: -(-4(u+7)), so:We get rid of parentheses
-4(u+7)
We multiply parentheses
-4u-28
Back to the equation:
-(-4u-28)
-6u+4u+28-30=0
We add all the numbers together, and all the variables
-2u-2=0
We move all terms containing u to the left, all other terms to the right
-2u=2
u=2/-2
u=-1
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