Question

E URGENTE /////////////////

Answer 1

1)

4x - 7 = 2x - 8

4x - 2x = - 8 + 7

   2x    = -1

     x = -1/2

2) 3 (x + 2 ) = 15

    3x + 6    = 15

    3x  = 15 -6

     3x = 11

       x = 11/3

3) 5 ( x - 4 ) = -3 +9 ( x -1 )

   5x - 20    = - 3 + 9x - 9

   5x - 9x = -3 -9 + 20

      -4x = -12 + 20

       -4x = 8

       -x = 8/4

       -x = 2. (-1)

        x = -2

4) 3 (x -4) + 8 = 5

   3x - 12 + 8 = 5

    3x = 5 - 8 + 12

     3x = -3 + 12

      3x = 9

      x = 9/3

       x = 3

5)  resolva primeiro o parênteses

$\frac{4x-2}{4} = \frac{5(x+3)}{2}\\\\\frac{4x-2}{4} = \frac{5x+15}{2} \\\\\frac{4x-2=10x+30}{4}\\\\4x-2=10x+30\\\\4x-10x = 30+2\\\\-6x = 32\\\\-x = \frac{32:2}{6:2} \\\\-x = \frac{16}{3} . (-1)\\\\x = - \frac{16}{3}$