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-12/5=4u
We move all terms to the left:
-12/5-(4u)=0
We multiply all the terms by the denominator
-4u*5-12=0
Wy multiply elements
-20u-12=0
We move all terms containing u to the left, all other terms to the right
-20u=12
u=12/-20
u=-3/5
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