A.  5x + 3 = 2x + 30

<=>5x - 2x = 30 - 3
<=> 3x = 27
<=> x = 27/3
<=> x = 9

Proef:

LL = RL = 48

D.  3x + 20 = 8x - 5

<=> 3x - 8x = - 5 - 20
<=> -5x = -25
<=> x = -25/-5

<=> x = 5

Proef:

LL = RL = 35

G.  2x + 1 = 10x - 7
<=> 2x - 10x = - 7 - 1
<=> -8x = -8
<=> x = -8/-8

<=> x = 1

Proef:

LL = RL = 3

B.  4x + 10 = 2x + 2
<=> 4x - 2x = 2 - 10
<=> 2x = -8
<=> x = -8/2

<=> x = -4

Proef:

LL = RL = -6

E.  7x + 19 = 2x + 29

<=> 7x - 2x = 29 - 19
<=> 5x = 10
<=> x = 10/5

<=> x = 2

Proef:

LL = RL = 33

H.  3x - 8 = x + 10

<=> 3x - x = 10 + 8
<=> 2x = 18
<=> x = 18/2
<=> x = 9

Proef:

LL = RL = 19

C.  6x - 7 = x + 8
<=> 6x - x = 8 + 7
<=> 5x = 15
<=> x = 15/5

<=> x = 3

Proef:

LL = RL = 11

F.  8x - 9 = 4x - 5

<=> 8x - 4x = -5 + 9
<=> 4x = 4

<=> x = 4/4
<=> x = 1

Proef:

LL = RL = -1

I.  x = 5x - 4

<=> x - 5x = - 4
<=> -4x = -4

<=> x = -4/-4
<=> x = 1

Proef:

LL = RL = 1