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

solve.

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

  • algebra - , Thursday, April 30, 2009 at 11:14pm

    i got -70/13

  • algebra - , Thursday, April 30, 2009 at 11:18pm

    how did you do that

  • algebra - , Friday, May 1, 2009 at 3:22am

    3x/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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