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17=-7u+3(u-5)
We move all terms to the left:
17-(-7u+3(u-5))=0
We calculate terms in parentheses: -(-7u+3(u-5)), so:We get rid of parentheses
-7u+3(u-5)
We multiply parentheses
-7u+3u-15
We add all the numbers together, and all the variables
-4u-15
Back to the equation:
-(-4u-15)
4u+15+17=0
We add all the numbers together, and all the variables
4u+32=0
We move all terms containing u to the left, all other terms to the right
4u=-32
u=-32/4
u=-8
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