anonymous
  • anonymous
((a-1)/8) - (3(a-4)/10) = ((2a+4)/5) help please
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
solve for a
anonymous
  • anonymous
\[\frac{ a-1 }{ 8 }-\frac{ 3(a-4) }{ 10 }=\frac{ 2a+4 }{ 5 }\] Your denominators are 8, 10 and 5. What's the smallest number that is divisible by all 3 (lcd)?
anonymous
  • anonymous
80?

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anonymous
  • anonymous
80's not the smallest, but it will still work :) You need to multiply each of the fractions by 80 so the denominators will cancel when you reduce. \[\frac{ 80(a-1) }{ 8 }-\frac{ (80)(3)(a-4) }{ 10 }=\frac{ 80(2a+4) }{ 5 }\]
anonymous
  • anonymous
i got 2.215
anonymous
  • anonymous
as my final answer
anonymous
  • anonymous
that's not what I got. Can you put up what you did?
anonymous
  • anonymous
i got -65/23 is that right? @peachpi
anonymous
  • anonymous
??
anonymous
  • anonymous
no. the 23 is right, so everything you did with the a is good. check your addition/subtraction with the constants
anonymous
  • anonymous
11?
anonymous
  • anonymous
yes
anonymous
  • anonymous
11/23
anonymous
  • anonymous
can u show me how you got that
anonymous
  • anonymous
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