Solve for u
u=40
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19=u-10-6-5
Subtract 12 from 2 to get -10.
19=u-16-5
Subtract 6 from -10 to get -16.
19=u-21
Subtract 5 from -16 to get -21.
u-21=19
Swap sides so that all variable terms are on the left hand side.
u=19+21
Add 21 to both sides.
u=40
Add 19 and 21 to get 40.
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