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-27=4(u-3)-7u
We move all terms to the left:
-27-(4(u-3)-7u)=0
We calculate terms in parentheses: -(4(u-3)-7u), so:We get rid of parentheses
4(u-3)-7u
We add all the numbers together, and all the variables
-7u+4(u-3)
We multiply parentheses
-7u+4u-12
We add all the numbers together, and all the variables
-3u-12
Back to the equation:
-(-3u-12)
3u+12-27=0
We add all the numbers together, and all the variables
3u-15=0
We move all terms containing u to the left, all other terms to the right
3u=15
u=15/3
u=5
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