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w) 4x=-12, x = -3

x) 35x=-105, x = -3

atividade 2:

a)9x-2=4x+18. 5x = 20, x = 4

b)2x-10+7x+10=180. 9x = 180, x = 20

c)7y-10=y+50. 6y = 60, y = 10

d)4x-18+3x=10. 7x = 28, x = 4

e)2x+5+x+7=18. 3x = 6, x = 2

f)5x-91=4x-77.  x = 14

g)7x+1=5x-7. 2x = -8, x = -4

h)4x+5=x+20. 3x = 15, x = 5

i)3(x+1)+2(2x-3)=5(x-1)+8.  2x = 6, x = 3

j)2(x+5)-4=26. 2x = 20, x = 10

k)3(x+3)-5=22.  3x = 18, x = 6

Resposta:

Explicação passo a passo:

W) 4x= -12

'x= -12/4'

*x = - 3"

______

x)35×= -105

"x = -105/35"

"x = -3"

Atividade 2:

a)9x-2=4x+18

*9x-4x= 18+2""

5x= 20"

"x = 20/5"

*x = 4"

b)2x-10+7x+10=180.

"9x= 180*

'x = 180/9'

"x = 20*

c)7y-10=y+50

7y -y=50 +10"

6y = 60"

"y = 60/6"

"y = 10*

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d)4x-18+3x=10.

"7x= 28"

x = 28/7*

"x=4"

_________

e)2x+5+x+7=18

"3x+12= 18"

3x= 18-12"

3x= 6*

x = "6/3*

*x =2"

f)5x-91=4x-77

5x-4x= 91-77

"x = 14"

___________

g)7x+1=5x-7

7x-5x= -7-1"

"2x= -8'

x = -8/2"

"x = -4"

______________

h)4x+5=x+20

'4x-x = 20-5'

"3x= 15"

"x = 15/3"

" X= 5 "

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i)3(x+1)+2(2x-3)=5(x-1)+8

"3x+3+4x-6=5x-5+8"

"7x-3= 5x+3"

"7x-5x = 3 + 3'

"2x= 6"

*x = 6/2"

"x = 3"

j)2(x+5)-4=26

2x+10-4= 26"

"2x+6= 26"

2x= 20"2"

x = 20/2"

x=10"

___________

(i)

3(x+3)-5=22

3x+9-5= 22"

=3x+4=22

3x= 18"3"

x= 18/3"

"x = 6*

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