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25=-4u+7(u+4)
We move all terms to the left:
25-(-4u+7(u+4))=0
We calculate terms in parentheses: -(-4u+7(u+4)), so:We get rid of parentheses
-4u+7(u+4)
We multiply parentheses
-4u+7u+28
We add all the numbers together, and all the variables
3u+28
Back to the equation:
-(3u+28)
-3u-28+25=0
We add all the numbers together, and all the variables
-3u-3=0
We move all terms containing u to the left, all other terms to the right
-3u=3
u=3/-3
u=-1
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