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-12/7=-4u
We move all terms to the left:
-12/7-(-4u)=0
We get rid of parentheses
4u-12/7=0
We multiply all the terms by the denominator
4u*7-12=0
Wy multiply elements
28u-12=0
We move all terms containing u to the left, all other terms to the right
28u=12
u=12/28
u=3/7
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