Question

(9)resolva: (a)x-5=15 (b)6x-4=2x+12 (c)x+8=17 (d)17x-2+4=20+5x

Answer 1

x - 5 = 15
x = 15 + 5
x =20

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

x + 8 = 17
x= 17 - 8
x=9



17x - 2 + 4 = 20 + 5x
17x - 5x = 20 + 2 - 4
12x = 18
x = 18/12
x  = 3/2           obs. Podemos simplificar 18 e 12 por 6.

Answer 2

Olá, bom dia ☺

Resoluções:

a)

x - 5 = 15.

x = 15 + 5.

x= 20.

b)

6x - 4 = 2x + 12

6x - 2x = 12 + 4.

4x = 16.

x=16/4.

x=4.

c)

x + 8 = 17.

x= 17 - 8.

x= 9.

d)

17x - 2 + 4 = 20 + 5x

17x  - 5x = 20 + 2 - 4.

12x= 18.

x=18/12 : 6/6 = 3/2

x=3/2.

Bons estudos :)