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28=4(u+3)-6u
We move all terms to the left:
28-(4(u+3)-6u)=0
We calculate terms in parentheses: -(4(u+3)-6u), so:We get rid of parentheses
4(u+3)-6u
We add all the numbers together, and all the variables
-6u+4(u+3)
We multiply parentheses
-6u+4u+12
We add all the numbers together, and all the variables
-2u+12
Back to the equation:
-(-2u+12)
2u-12+28=0
We add all the numbers together, and all the variables
2u+16=0
We move all terms containing u to the left, all other terms to the right
2u=-16
u=-16/2
u=-8
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