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u/2+9=12
We simplify the equation to the form, which is simple to understand
u/2+9=12
We move all terms containing u to the left and all other terms to the right.
+ 0.5u=+12-9
We simplify left and right side of the equation.
+ 0.5u=+3
We divide both sides of the equation by 0.5 to get u.
u=6
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