équations a résoudre x (inconnues) 7x+11=5x-12 7x-7=4x-12 7(x-7)-(4x+11)=4x-12

Bonjour,

Équations a résoudre x (inconnues)

7x+11=5x-12

7x - 5x = -12 - 11

2x = -23

x = -23/2

7x-7=4x-12

7x - 4x = -12 + 7

3x = -5

x = -5/3

7(x-7)-(4x+11)=4x-12

7x - 49 - 4x - 11 = 4x - 12

3x - 60 = 4x - 12

4x - 3x = 12 - 60

x = -48