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-30=-2u+7(u-5)
We move all terms to the left:
-30-(-2u+7(u-5))=0
We calculate terms in parentheses: -(-2u+7(u-5)), so:We get rid of parentheses
-2u+7(u-5)
We multiply parentheses
-2u+7u-35
We add all the numbers together, and all the variables
5u-35
Back to the equation:
-(5u-35)
-5u+35-30=0
We add all the numbers together, and all the variables
-5u+5=0
We move all terms containing u to the left, all other terms to the right
-5u=-5
u=-5/-5
u=1
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