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6x + 12 = 42

40 - 6x =28

3x -12 = 2x + 1

4x - 3 = 7x -24


Odpowiedź :

6x + 12 = 42

6x = 42 - 12

6x = 30  / : 5

x = 6

40 - 6x = 28

-6x = 28 - 40

-6x = -12  / : (-6)

x = 2

3x - 12 = 2x + 1

3x - 2x = 1 + 12

x = 13

4x - 3 = 7x - 24

4x - 7x = -24 + 3

-3x = -21  / : (-3)

x = 7

Odpowiedź:

6x + 12 = 42

6x = 42 - 12

6x = 30 /÷6

x = 5

Spr. 6×5+12=42

30+12=42

42=42

L=P

40 - 6x =28

- 6x = 28 - 40

- 6x = - 12 /÷(-6)

x = 2

Spr. 40-6×2=28

40-12=28

28=28

L=P

3x -12 = 2x + 1

3x - 2x = 1 + 12

x = 13

Spr. 3×13-12=2×13+1

39-12=26+1

27=27

L=P

4x - 3 = 7x -24

4x - 7x = - 24 + 3

- 3x = - 21 /÷(-3)

x = 7

Spr. 4×7-3=7×7-24

28-3=49-24

25=25

L=P