Question

hallar el valor de x
a) x-5/x+3=3/7
b) -2x=-9
c) 5x+3(x+2)=6(x+3)

Answer 1

x - 5        3
--------  = -----
x + 3       7

7x - 35 = 3x + 9
7x - 3x = 9 + 35
    4x   = 44
     x = 11

-2x = -9
 2x = 9
   x = 9/2

5x + 3 (x+2) = 6 (x+3)
5x + 3x + 6 = 6x + 18
8x + 6 = 6x + 18
8x - 6x = 18 - 6
      2x = 12
       x = 12/2
       x = 6