Bonsoir,
a) x - 2 = 2x + 5
• x - 2x = 5 + 2
• -x = 7
• x = 7/(-1) = -7 ✅
b) 4t - 3 = 2(t - 9)
• 4t - 3 = 2 × t + 2 × (-9)
• 4t - 3 = 2t - 18
• 4t - 2t = -18 + 3
• 2t = -15
• t = -15/2 ✅
c) 5a - 3(a - 1/3) = 0
• 5a - 3 × a - 3 × (-1/3) = 0
• 5a - 3a - (-3/3) = 0
• 2a + 1 = 0
• 2a = -1
• a = -1/2 ✅
d) 4(-2x + 3) - 7 = 5x - 8
• 4 × (-2x) + 4 × 3 - 7 = 5x - 8
• -8x + 12 - 7 = 5x - 8
• -8x + 5 = 5x - 8
• -8x - 5x = -8 - 5
• -13x = -13
• x = -13/(-13) = 1 ✅
Bonne journée !
