Bonjour,
A = 14 - (- x - 7)
= 14 + x + 7
= x + 21
C = - (21 - 2x)
= 2x - 21
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Bonjour,
A = 14 - (- x - 7)
= 14 + x + 7
= x + 21
C = - (21 - 2x)
= 2x - 21