Question

alguem pode me ajudar pfv? é pra hoje!

Answer 1

Resposta:

5-

a)3x+8=15-4x

3x+4x=15-8

7x=7

x=7/7

x=1

b)2x=14

x=14/2

x=7

c)4x=-12

x=-12/4

x=-3

d)7x=-21

x=-21/7

x=-3

e)13x=13

x=13/13

x=1

f)9x+3=-9

9x=-9-3

9x=12

x=-12/9

x=-4/3 ou -1,3...

g)25x-1=8

25x=8+1

x=9/25 ou 0,36

h)35x-25x=-105+5

60x=-100

x=-100/60 : 5

x=20/12 : 4

x=5/3 ou 1,6...

i)4x-1=1+3x

4x-3x=1+1

x=2

j)36x-24=12

36x=12+24

36x=36

x=36/36

x=1

k)21x+18=3x

21x-3x=-18

18x=-18

x=-18/18

x=-1

l)6x=8x-12

6x-8x=-12

-2x=12.(-1)

2x=-12

x=-12/2

x=-6