7. Résoudre les équations suivantes d'inconnue.x- (a) 3x + 15 = 60 (b) tx - 21 = 49 d) 5 (4x-1)= 65 e) 7x = 11 = 8x = 25 (c) 2 (4-3x) = 2.6 (4) 5x +31 = 2x + 64.​
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