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-17=3(u+5)-7u
We move all terms to the left:
-17-(3(u+5)-7u)=0
We calculate terms in parentheses: -(3(u+5)-7u), so:We get rid of parentheses
3(u+5)-7u
We add all the numbers together, and all the variables
-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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