Question

resolva a equação a) 2(2x+7)+3(3x-5)=3(4x+5)-1
b)3-7(1-2x)=5-(x+9)
c)1+7x-3(1-2x)=(3-4x)2-8(x+9)
d)x-3(4-x)=7x-(1-x)

Answer 1

a) 2(2x+7)+3(3x-5)=3(4x+5)-1

    4x + 14 + 9x - 15 = 12x + 15 - 1

    4x + 9x - 12x = 15 - 1 -14 + 15

     x = 15

b)3-7(1-2x)=5-(x+9)

  3 - 7 - 14x = 5 - x - 9

    -14x + x = 5 - 9 - 3 + 7

           - 13x = 0

                - x = 0/13 (-1)

                  x = 0

c)1+7x-3(1-2x)=(3-4x)2-8(x+9)

 1 + 7x - 3 - 6x = 6 - 8x -8x - 72

      7x - 6x + 16x = -72 + 1 + 3

              17x = - 68

                 x = -68/17 = - 4

d)x-3(4-x)=7x-(1-x)

 x - 12 + 3x = 7x - 1 + x

x - x + 3x - 7x = -1 + 12

                 - 4x = 11  (-1)

                     x = - 11/4