Question

DETERMINE A SOLUÇÃO DESTAS EQUAÇÃO ?

15­) x-x-x-x=78
16) 2x+3x+4=189
17)5X-4-3X=-16
18)5X+X-4/9=-4

Answer 1

Olá,

15)

x-x-x-x = 78
x-3x = 78
-2x = 78
-2x/-2 = 78/-2
x = -39

16)

2x+3x+4 = 189
5x+4 = 189
5x = 189-4
5x = 185
5x/5 = 185/5
x = 37

17)

5x-4-3x = -16
2x-4 = -16
2x = -16+4
2x = -12
2x/2 = -12/2
x = -6

18)

5x+x-4/9 = -4
6x = -4+4/9
6x = (-36+4)/9
6x = -32/9
6x/6 = (-32/9)/6
x = -32/(9×6)
x = -32/54
x = -16/27

Answer 2

15) x-3x=78
      -2x=78
         x=78/-2
          x=-39

16) 5x=189-4
       x=185/5
         x=37

17) 2x=-16+2
        x= -14/2
         x= -7
18) 6x=-4+4/9
      9*6x=-4*9+4
      54x=-36+4
          x= -32/54
          simplificando por 2
x= -16/27