Question

determine o valor de x em cada equação:
a)3x -7=17
b)5x-6=-21
c)-2x=8
d)9x+15=-21
e)4x +8=23-x
f)7x-14=2x+10 -x
g)4x+34-x=-2x +4
h)5x+18-x=+12+x
i)9x-13=x+20-3×
j)2x-5+3x=20+x-1​

Answer 1

Resposta:

A) 3x - 7 =17

3x= 17 + 7

3x = 24

x = 24/3

x = 8

B) 5x - 6 = - 21

5x = - 21 + 6

5x = - 15

x = - 15 /5

x = - 3

C) - 2x =8

x = 8/2

x = 4

D) 9x + 15 = -21

9x = - 21 - 15

9x = - 36

x = - 36/9

x = - 4

E) 4x + 8 = 23 - x

4x + x = 23 - 8

5x = 15

x = 15/5

x = 3

F) 7x - 14 = 2x + 10 - x

7x - 2x + x = 10 + 14

6x = 24

x = 24/6

x = 4

G) 4x + 34 - x = -2x + 4

4x - x + 2x = 4 - 34

5x = - 30

x = -30/5

x = -6

H) 5x + 18 - x = +12 + x

5x - x - x = 12 - 18

3x = - 6

x = - 6/3

x = - 2

I) 9x - 13 = x + 20 - 3x

9x - x + 3x = 20 + 13

11x = 33

x = 33/11

x = 3

J) 2x - 5 + 3x = 20 + x - 1

2x + 3x - x = 20 - 1 + 5

4x = 24

x = 24/4

x = 6

Espero ter ajudado!