SOLUTION: Solve for u 1/2u-2/3=-4/7

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Question 627149: Solve for u
1/2u-2/3=-4/7
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
%281%2F2%29u-2%2F3=-4%2F7 Start with the given equation.


42%28%281%2Fcross%282%29%29u-2%2Fcross%283%29%29=42%28-4%2Fcross%287%29%29 Multiply both sides by the LCD 42 to clear any fractions.


21u-28=-24 Distribute and multiply.


21u=-24%2B28 Add 28 to both sides.


21u=4 Combine like terms on the right side.


u=%284%29%2F%2821%29 Divide both sides by 21 to isolate u.


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Answer:

So the solution is u=4%2F21
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