Question

a)x-5=20
b)x+6=3.5
c)2.x+3=9
d)3.x-5=10
e)7.x+18=2.9
f)7x-3x+2=18
g)10x-2x-5=11
h)5x+x-4=23-9
i)4x-9+x=8+2x+13
k)3x-21+23+4x=2x+22
l)2x+15+x-6=29-x

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Answer 1

Respuesta:

a)

x-5=20

x = 20 + 5

x = 25

b)

x+6=3.5

x = 3.5 - 6

x = -2.5

c)

2.x+3=9

2x  = 9 - 3

2x = 6

x = 6/ 2

x = 3

d)

3.x-5=10

3x = 10 + 5

3x = 15

x = 15/3

e)

7.x+18=2.9

7x = 2.9 - 18

7x = -15.1

x = -15.1/7

x = -2.16

f)

7x-3x+2=18

4x = 18 - 2

4x = 16

x = 16/4

x = 4

g)

10x-2x-5=11

8x = 11 + 5

8x = 16

x = 16/8

x = 2

h)

5x+x-4=23-9

6x = 23 - 9 + 4

6x = 18

x = 18/6

x = 3

i)

4x-9+x=8+2x+13

4x + x - 2x = 8 + 13 + 9

3x = 30

x = 30/3

x = 10

k)

3x-21+23+4x=2x+22

3x + 4x - 2x = 22 + 21 - 23

5x = 20

x = 20/5

x = 4

l)

2x+15+x-6=29-x

2x + x + x = 29 - 15 + 6

4x = 20

x = 20/4

x = 5

Explicación paso a paso: