Sagot :
bjr
5×(2x+1)−7=3×(7x−15)−1
5*2x + 5*1 - 7 = 3*7x + 3*(-15) - 1
10x + 5 - 7 = 21x - 45 - 1
10x - 2 = 21x - 46
10x - 21x - 2 + 2 = 21x - 21x - 46 + 2
-11x = -44
x = 44/11
x = 4
1/3x - 4/3 + 4/3 = 2/9 + 4/3
1/3x = 2/9 + 12/9
1/3x = 14/9
1/3x * 3/1 = 14/9 * 3/1
x = 14/9 * 3
x = 14/3
Réponse :
résous l'équation
5(2 x + 1) - 7 = 3(7 x - 15) - 1 ⇔ 10 x + 5 - 7 = 21 x - 45 - 1
⇔ 10 x - 2 = 21 x - 46 ⇔ 11 x = 44 ⇔ x = 44/11 = 4
1/3) x - 4/3 = 2/9 ⇔ (1/3) x = 2/9 + (4/3) ⇔ (1/3) x = 14/9 ⇔ x = 14/3
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