Question

Quanto é:
12/2x-3 = 4

5x+3/x = 2

1/4x + 1/12 = 2/3x

4/3x - x+3/6x = 2

3/x-1 + 4x/x-1 = 4

Answer 1

  12   = 4 =>4(2x-3) = 14=> 8x - 12 = 14 => 8x = 14+12==> 8x=26=>x = 26/8
2x-3 
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5x+3 = 2 ==> 5x + 3 =2x  ==. 5x - 2x = - 3 ==> 3x = - 3 ==. x = - 1
    x
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1x +  1   = 2x                   mmc = 12
4      12     3

==> 3x + 1 = 8x ==> 8x-3x = 1 ==> 5x = 1 ==> x = 1/5 

4/3x - x+3/6x = 2
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 3   +  4x = 4                mmc = x - 1
x-1    x-1

3 + 4x = 4(x-1) ==> 4x - 4 = 3 + 4x ==> 4x - 4x = 3+4 ==> 0x = 7

indeterminado