at_answer_text_math
a = 17c
b = 13+y
c=12l (je vois pas la lettre)
d=z²-7²
e =3a²+18
f =b*(2b-3)*6 = b(12b-18) = 12b²-18b
at_explanation_text_math
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at_answer_text_math
a = 17c
b = 13+y
c=12l (je vois pas la lettre)
d=z²-7²
e =3a²+18
f =b*(2b-3)*6 = b(12b-18) = 12b²-18b
at_explanation_text_math