Sagot :
a)
A = 5(3x - 2) + 4
A = 15x - 10 + 4
A = 15x - 6
b)
Si x = 7 alors
B = 15x - 6
B = 15*7 - 6
B = 105 - 6
B = 99
c)
15x - 6 = 0
15x - 6 + 6 = 0 + 6
15x / 15 = 6 / 15
x = 2/5
a) A=5x 3x - 5x2 +4
A=15x -10 -4
A= 15x -14
b) B= 15x 7 -6
B= 105-6
B= 99