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April 19, 2014

April 19, 2014

Posted by **jaz** on Thursday, April 30, 2009 at 11:12pm.

3x/2 + 8-4x/7=3

- algebra -
**Anonymous**, Thursday, April 30, 2009 at 11:14pmi got -70/13

- algebra -
**jaz**, Thursday, April 30, 2009 at 11:18pmhow did you do that

- algebra -
**RickP**, Friday, May 1, 2009 at 3:22am3x/2 + 8-4x/7=3

The denominators are 2 and 7, and the LCM for them is their product: 2 x 7 = 14. So multiply through (multiply each term on both sides of the equation) by 14 to eliminate the fractions.

14(3x/2) + 14(8) + 14(-4x/7) = 14(3)

21x + 112 - 8x = 42

combine like terms

21x - 8x + 112 = 42

13x + 112 = 42

isolate x: start by subtraction 112 from both sides

13x = 42 - 112

combine like terms

13x = -70

divide both sides by 13 to get x by itself

x = -70/13

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