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9=-8u+3(u-7)
We move all terms to the left:
9-(-8u+3(u-7))=0
We calculate terms in parentheses: -(-8u+3(u-7)), so:We get rid of parentheses
-8u+3(u-7)
We multiply parentheses
-8u+3u-21
We add all the numbers together, and all the variables
-5u-21
Back to the equation:
-(-5u-21)
5u+21+9=0
We add all the numbers together, and all the variables
5u+30=0
We move all terms containing u to the left, all other terms to the right
5u=-30
u=-30/5
u=-6
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