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9u+21=-4(u-2)
We move all terms to the left:
9u+21-(-4(u-2))=0
We calculate terms in parentheses: -(-4(u-2)), so:We get rid of parentheses
-4(u-2)
We multiply parentheses
-4u+8
Back to the equation:
-(-4u+8)
9u+4u-8+21=0
We add all the numbers together, and all the variables
13u+13=0
We move all terms containing u to the left, all other terms to the right
13u=-13
u=-13/13
u=-1
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