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-21=-7u+4(u-3)
We move all terms to the left:
-21-(-7u+4(u-3))=0
We calculate terms in parentheses: -(-7u+4(u-3)), so:We get rid of parentheses
-7u+4(u-3)
We multiply parentheses
-7u+4u-12
We add all the numbers together, and all the variables
-3u-12
Back to the equation:
-(-3u-12)
3u+12-21=0
We add all the numbers together, and all the variables
3u-9=0
We move all terms containing u to the left, all other terms to the right
3u=9
u=9/3
u=3
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