algebra
posted by jaz
solve.
3x/2 + 84x/7=3

Anonymous
i got 70/13

jaz
how did you do that

RickP
3x/2 + 84x/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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