Question

a) 8x + 4 – 4x = 40

b) 25x + 5 – 15x =35

c) 2x – ( 3 – x )= 3x

d) 8 – (3 – 2x ) = 1+2(x+2)

e) 2(x –2x+1)= x

Answer 1

Hola!

a) 8x + 4 – 4x = 40

8x-4x+4=40

4x+4=40

4x+4-4=40-4

4x=36

x=9

b) 25x + 5 – 15x =35

25x-15x+5=35

10x+5=35

10x+5-5=35-5

10x=30

x=3

c) 2x – ( 3 – x )= 3x

3x-3=3x

3x-3+3=3x+3

3x=3x+3

3x-3x=3x+3-3x

0=3

d)8 – (3 – 2x ) = 1+2(x+2)

2x+5=2x+5

2x+5-5=2x+5-5

2x=2x

2x-2x=2x-2x

0=0

e) 2(x –2x+1)= x

-2x+2=x

-2x+2-2=x-2

-2x=x-2

-2x-x=x-2-x

-3x=-2

$x=\dfrac{2}{3}$

Saludos Cordiales