Question

A) 3x-7=x+5

B) 7x+8=4x-10

C) 4x-15=2x+3

D) 2x-4-8=4x

E) 3x=x+1+7

F) 360+36x=30x

G) 2x+5-5x=-1

H) 5+6x=5x+2

I) x+2x-1-3=x

J) 5x-5+x=9+x

Answer 1

Explicação passo-a-passo:

a) 3x-7=x+5

3x-x= +5 +7

2x= 2

x=2

B) 7x+8=4x-10

7x-4x= -10-8

3x= -18

x= -6

C) 4x-15=2x+3

4x-2x= +3+15

2x= +18

x= 9

D) 2x-4-8=4x

2x-4x= +4+8

-2x= +12

x= 6

E) 3x=x+1+7

3x-x= +1+7

2x= +8

x= +4

F) 360+36x=30x

36x-30x= -360

6x= -360

x= -60

G) 2x+5-5x=-1

2x-5x= -1-5

-3x= -6

x= 2

H) 5+6x=5x+2

6x-5x=+2-5

x= -3

I) x+2x-1-3=x

x+ 2x-x= +1+3

2x = +4

x= +2

J) 5x-5+x=9+x

5x+x-x= +9+5

5x= 14

x= 2,8

Answer 2

Resposta:

$a)3x - 7 = x + 5 \\ 3x - x = 5 + 7 \\ 2x = 12 \\ x = 12 \div 2 \\ x = 6 \\ \\ b)7x + 8 = 4x - 10 \\ 7x - 4x = - 10 - 8 \\ 3x = - 18 \\ x = - 18/3 \\ x = - 6$

$c)4x - 15 = 2x + 3 \\ 4x - 2x = 3 + 15 \\ 2x = 18 \\ x = 18 \div 2 \\ x = 9 \\ \\ d)2x - 4 - 8 = 4x \\ 2x - 12 = 4x \\ 2x - 4x = 12 \\ - 2x = 12 \\ x = 12 \div ( - 2) \\ x = - 6$

$e)3x = x + 1 + 7 \\ 3x =x + 8 \\ 3x - x = 8 \\ 2x = 8 \\ x = 8 \div 2 \\ x = 4$

$f)360 + 36x = 30x \\ 36x - 30x = - 360 \\ 6x = - 360 \\ x = - 360 \div 6 \\ x = - 60$

$g)2x + 5 - 5x = - 1 \\ - 3x + 5 = - 1 \\ - 3x = - 1 - 5 \\ - 3x = - 6 \\ x = - 6 \div ( - 3) \\ x = 2$

$h)5 + 6x = 5x + 2 \\ 6x - 5 x = 2 - 5 \\ x = - 3$

$i)x + 2x - 1 - 3 = x \\ 2x - 1 - 3= 0 \\ 2x - 4 = 0 \\ 2x = 4 \\ x = 4 \div 2 \\ x = 2$

$5x - 5 +x = 9 + x \\ 5x - 5 = 9 \\ 5x = 9 + 5 \\ 5x = 14 \\ x = 14 \div 5 \\ x = 2,8$

• Espero ter ajudado.