X désigne un nombre relatif.
écrire les expressions sans paranthèses égale aux expression donnés, puis effectuer les calculs possibles.

a) -7,5-(x+4)


b)4,2-(-3+x)
d)5-(4x-2)
f-12+(9-2x)

c)-7+(-3x+5)
e) 8-(-5x+1)
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