Question

RESOLVA AS EQUAÇÕES :

a)3 ( x -1 ) -7 = 15
b)7 ( x -4 ) = 2x -3
c)3 ( x -2 ) = 4 ( 3 -x )

Answer 1

RESOLVA AS EQUAÇÕES :a)3 ( x -1 ) -7 = 15

   3(x - 1) - 7 = 15
    3x - 3 -  7 = 15
    3x - 10 = 15
3x = 15 + 10
3x = 25
x = 25/3

b)7 ( x -4 ) = 2x -3

   7(x - 4) = 2x - 3
    7x - 28 = 2x - 3
7x - 28 - 2x = - 3
7x - 2x = - 3 + 28
5x = 25
x = 25/5
x = 5

c)3 ( x -2 ) = 4 ( 3 -x )
  
  3(x - 2) = 4(3 - x)
   3x - 6  = 12 - 4x
   3x - 6 + 4x = 12
3x + 4x = 12 + 6
7x =18
x = 18/7