bonjour j ai besoin d aide en mathématique sur les équation du premier degré merci par avance 20-4x=16 100+2x=175 3(x+3)=21 56=2x+6 120=4x+40 8x+100=124 75+4x=1

Bonjour

20-4x=16

- 4x = 16 - 20

- 4x = - 4

x = 4/4

x = 1

100+2x=175

2x = 175 - 100

2x = 75

x = 75/2

3(x+3)=21

3x + 9 = 21

3x = 21 - 9

3x = 12

x = 12/3

x = 4

56=2x+6

2x = 56 - 6

2x = 50

x = 50/2

x = 25

120=4x+40

4x = 120 - 40

4x = 80

x = 80/4

x = 20

8x+100=124

8x = 124 - 100

8x = 24

x = 24/8

x = 3

75+4x=150+x

4x - x = 150 - 75

3x = 75

x = 75/3

x = 25.