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-13=-7u+2(u+6)
We move all terms to the left:
-13-(-7u+2(u+6))=0
We calculate terms in parentheses: -(-7u+2(u+6)), so:We get rid of parentheses
-7u+2(u+6)
We multiply parentheses
-7u+2u+12
We add all the numbers together, and all the variables
-5u+12
Back to the equation:
-(-5u+12)
5u-12-13=0
We add all the numbers together, and all the variables
5u-25=0
We move all terms containing u to the left, all other terms to the right
5u=25
u=25/5
u=5
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