bonjour
A = - 6 x - 15 + ( - 2 x + 6 x + 5 x - 15)
a = - 6 x + 15 - 2 x + 6 x + 5 x - 15
A = 3 x
B = 6 a - 8 a² - 15 + 20 a - 10 + 2 a
B = - 8 a² + 28 a - 25
C = - ( 3 z - 6 - 4 z² + 8 z )
C = - 3 z + 6 + 4 z² - 8 z
C = 4 z² - 11 z + 6
d = - 10 r + 15 r² - r - 2 - 2 r - 5
d = 15 r² - 13 r - 7
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bonjour
A = - 6 x - 15 + ( - 2 x + 6 x + 5 x - 15)
a = - 6 x + 15 - 2 x + 6 x + 5 x - 15
A = 3 x
B = 6 a - 8 a² - 15 + 20 a - 10 + 2 a
B = - 8 a² + 28 a - 25
C = - ( 3 z - 6 - 4 z² + 8 z )
C = - 3 z + 6 + 4 z² - 8 z
C = 4 z² - 11 z + 6
d = - 10 r + 15 r² - r - 2 - 2 r - 5
d = 15 r² - 13 r - 7