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what is 12 over 5 x - 2x = 3 over 10? by the way there are fractions (12/5 and 3/10) I don't get how to do equations with fractions, plase help. -Sdgaeth

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2 Answers

(12/5x)-2x=3/10
Multiply each term by 10x to get rid of fractions
  24-20x^2=3x
Set up quadratic equation
  20x^2+3x-24=0
Solve using quadratic formula
   x=(-3+/-sqt(3^2-4(20)(-24)))/(2*20)
    =(-3+/-sqt(1929))/40
(12/5)x - 2x = 3/10 

Let's multiply each term of given equation by 10 (just to get rid of denominators): 

       12                              3
10 • ---- x - 10 • 2x = 10 • ---- 
        5                               10  

24x - 20x = 3 

4x = 3 

x = 3/4 = 0.25  

OR 
 
    2               3
1 --- x - 2x = ---
    5              10

  7                     3
 ---x  -  2x  =  ----  
  5                    10 

        7                                  3
10 • --- x  -  10 • 2x  =  10 • ----
        5                                 10 

14x - 20x = 3 

- 6x = 3 

x = - (1/2) = - 0.5 

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