Question

b) 5x – 3 = 2x + 9
c) 3(2x – 3) + 2(x + 1) = 3x + 18
d) 2x + 3(x – 5) = 4x + 9
e) 2(x + 1) – 3(2x – 5) = 6x – 3
f) 3x – 5 = x – 2
g) 3x – 5 = 13
h) 3x + 5 = 2
i) x – (2x – 1) = 23
j) 2x – (x – 1) = 5 – (x – 3)
Alguém me responde pvrf

Answer 1

Resposta:

b) 5x – 3 = 2x + 9

5x-2x=9+3

3x=12

x=3/12

x=4

c) 3(2x – 3) + 2(x + 1) = 3x + 18

6x-9+2x+2=3x+18

6x+2x-3x=18+9-2

5x=25

x=25/5

x=5

d) 2x + 3(x – 5) = 4x + 9

2x+3x-15=4x+9

5x-4x=9+15

x=24

e) 2(x + 1) – 3(2x – 5) = 6x – 3

2x+2-6x+15=6x-3

2x-6x-6x= -3-2-15

-10x= -20

-x= -20/10

-x= -2 (-1)

x=2

f) 3x – 5 = x – 2

3x-x= -2+5

2x=3

x= 3/2 ou x=1,5

g) 3x – 5 = 13

3x= 13+5

3x=18

x=18/3

x=6

h) 3x + 5 = 2

3x= 2-5

3x= -3

x= -3/3

x= -1

i) x – (2x – 1) = 23

x-2x+1=23

-x=23-1

-x=22 (-1)

x= -22

j) 2x – (x – 1) = 5 – (x – 3)

2x-x+1=5–x+3)

x+x=5+3-1

2x=7

x=7/2 ou x=3,5