# algebra

solve.

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

1. i got -70/13

posted by Anonymous
2. how did you do that

posted by jaz
3. 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

posted by RickP

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