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t = 2m - 3
dit :
7m - 2t?
dij :
7m - 2t
= 7m -2(2m-3)
= 7m - 4m + 6
= 3m + 6
7 m - 2t = 7m - 2(2m - 3) = 7m - 4m +6 = 3m +6