Bài 3 mik gửi ảnh ở dưới r nhé.
18x - 19 = 21 + 8x
<=> 18x - 8x = 21 + 19
<=> 10x = 40
<=> x = 4
Vậy x = 4
g) 18 - 4x = -20 - 6x
<=> -4x + 6x = -20 - 18
<=> 2x = -38
<=> x = -19
Vậy x = -19
h) -15 x 24 = -7x + 32
<=> -360 = -7x + 32
<=> 7x = 360 + 32
<=> 7x = 392
<=> x = 56
Vậy x = 56
i) 15x - 3(4x - 6) = -12 + 36
<=> 15x - 12x + 18 = 24
<=> 3x = 24 - 18
<=> 3x = 6
<=> x = 2
Vậy x = 2
k) -10 x - 27 = -7x + 33
<=> -10x + 7x = 33 + 27
<=> -3x = 60
<=> x = -20
Vậy x = -20
m) -17 x (-24) = -9x - 40
<=> 408 = -9x - 40
<=> 9x = -40 - 408
<=> 9x = -448
<=> x = -$\frac{448}{9}$
Vậy x = -$\frac{448}{9}$
n) -23 x 25 = -18x + 75
<=> -575 = -18x + 75
<=> 18x = 75 + 575
<=> 18x = 650
<=> x = $\frac{325}{9}$
Vậy x = $\frac{325}{9}$
p) -5x + 7(2x - 3) = 4(x - 4)
<=> -5x + 14x - 21 = 4x - 16
<=> -5x + 14x - 4x = -16 + 21
<=> 5x = 5
<=> x = 1
Vậy x = 1
q) 24 - 6(3x + 1) = -5(4x - 4) - 8
<=> 24 - 18x - 6 = -20x + 20 - 8
<=> -18x + 20x = 20 - 8 - 24 + 6
<=> 2x = -6
<=> x = -3
Vậy x = -3
r) 18 - 4.(6 - 2x) = -3.(4x + 5) - 11
<=> 18 - 24 + 8x = -12x - 15 - 11
<=> 8x + 12x = -15 - 11 - 18 + 24
<=> 20x = -20
<=> x = -1
Vậy x = -1
s) -5.(4x - 5) - 14 = 6.(2 - 3x) - 10x - 9
<=> -20x + 25 - 14 = 12 - 18x - 10x - 9
<=> -20x + 18x + 10x = 12 - 9 - 25 + 14
<=> 8x = -8
<=> x = -1
Vậy x = -1
