Question

Qual a resposta das seguintes questões???????

a)7x+1=6x+6
b)5x-3=2x-9
c)x/3+4x=39
d)X+X/2=12
e)X/4-1=2+X/10
f)50+(3x-4)=2(3x-4)+26
g)x/2+4x=15-(-x-6)
h)2(2x-4)=5-(x/2 + 4)

Answer 1

a) 7x + 1 = 6x + 6

7x - 6x = 6 - 1

x = 5

b) 5x - 3 = 2x - 9

5x - 2x = - 9 + 3

3x = - 6

x = - 6/3

x = - 2

c) x/3 + 4x = 39

x/3 + 12x/3 = 117/3

x + 12x = 117

13x = 117

x = 117/13

x = 9

d) x + x/2 = 12

2x/2 + x/2 = 24/2

2x + x = 24

3x = 24

x = 24/3

x = 8

e) x/4 - 1 = 2 + x/10

5x/20 - 20/20 = 40/20 + 2x/20

5x - 20 = 40 + 2x

5x - 2x = 40 + 20

3x = 60

x = 60/3

x = 20

f) 50 + (3x-4) = 2(3x-4) + 26

50 + 3x - 4 = 6x - 8 + 26

3x + 46 = 6x + 18

6x - 3x = 46 - 18

3x = 28

x = 28/3

g) x/2 + 4x = 15 - (-x-6)

x/2 + 8x/2 = 30/2 - 2(-x-6)/2

x + 8x = 30 - 2(-x-6)

x + 8x = 30 + 2x + 12

9x = 2x + 42

9x - 2x = 42

7x = 42

x = 42/7

x = 6

h) 2(2x-4) = 5-(x/2 + 4)

4x - 8 = 5 - x/2 - 4

8x/2 - 16/2 = 10/2 - x/2 - 8/2

8x - 16 = 10 - x - 8

8x - 16 = - x + 2

8x + x = 2 + 16

9x = 18

x = 18/9

x = 2