Question

resolva cada equação :

A) 3x - 8 = 7

B) 6x + 1 = 4x - 21

C) 5 . ( x + 6 ) = 6 . (2x + 8) + 3

D) x - 7 = x/8

E) (2x/5) + 1 = ( x + 10 ) / 7 ​

Answer 1

Resposta:

a 3x-8=7

3x=7+8

3x=15

x=15/3

x=5

b 6x+1=4x-21

6x-4x=-21-1

2x= -22

x= -22/2

x=-11

c)5(x+6)= 6(2x+8)+3

5x+30 = 12x+48 +3

5x-12x= 3+48-30

-7x= 21 (× -1)

7x= -21

x=-21/7

x=-3

d) x-7=x/8

mmc =8

8x-56= x

8x-x=-56

7x= -56

x= -56/7

x=-8