Question

1. 3,5 - 0,21x = 4,2 + 0,07x

2. 4- 2/5x = 1/2x + 2

3. 3/4x - 3 = 1/2 - 3/8x

Proszę o szybkie rozwiązanie

Answer 1

1.   3,5 - 0,21x = 4,2 + 0,07x

-0.21x-0.07x=4.2-3.5

-0.28x=0.7/(-0.28)

x=-2.5

2.   4- 2/5x = 1/2x + 2

4-0.4x=0.5x+2

-0.4x-0.5x=2-4

-0.9x=-2/(-0.9)

x=2.22.....

3.   3/4x - 3 = 1/2 - 3/8x

0.75x-3=0.5-0.375x

0.75x+0.375x=0.5+3

1.125x=3.5/1.125

x=3.11....

Answer 2

1  3,5 - 0,21x = 4,2 + 0,07x

- 0,21x - 0,07x = -3,5 + 4,2

-0,28x = 0,7

-x = 2,5

x= -2,5

 

2   4- 2/5x = 1/2x + 2

-2/5x - 1/2x = 2 - 4

- 4/10x - 5/10x = - 2

-9/10x = -2

-0,9x = -2

0,9x= 2

x = 20/9

 

3  3/4x - 3 = 1/2 - 3/8x

3/4x + 3/8x = 1/2 + 3

6/8x + 3/8x = 7/2

9/8x = 7/2

x = 28/9