Bonjour, voici un exercice de maths . merci d'avance

Recopier et compléter par les signes + ou -
a. 4 (3x - 5) = ... 12x ... 20
b. - 4(3x – 5) = ... 12x ... 20
c. 4(-3x - 5) = ... 12x ... 20
d. -4(-3x + 5) = ... 12x... 20
e. -4(-3x - 5) = ... 12x ... 20​
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