Réponse:
a-2x+1=13
:2x=13-1
:x=12/2
:x=6
B-14=20-3x
:3x=20-14
:x=6/3
:x=2
c-2x+1=1
:2x=1-1
:x=0/2
:x=0
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Réponse:
a-2x+1=13
:2x=13-1
:x=12/2
:x=6
B-14=20-3x
:3x=20-14
:x=6/3
:x=2
c-2x+1=1
:2x=1-1
:x=0/2
:x=0