A = 1 - 2 + 3 - 4
A = - 1 + 3 - 4
A = - 1 + (- 1)
A = - 2
Et voilà !
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Verified answer
A = 1 - 2 + 3 - 4
A = - 1 + 3 - 4
A = - 1 + (- 1)
A = - 2
Et voilà !