giải các phương trình sau: a) 4x.(2x+3) – x.(8x-1)= 5.(x+2) b) (3x-5).(3x+5) – x.(9x-1) = 4 c) 3 – 4x . (25-2x) = 8x^2 + x – 300 d) 2. (1-3x/5) – 2+3x

giải các phương trình sau:
a) 4x.(2x+3) – x.(8x-1)= 5.(x+2)
b) (3x-5).(3x+5) – x.(9x-1) = 4
c) 3 – 4x . (25-2x) = 8x^2 + x – 300
d) 2. (1-3x/5) – 2+3x/10 = 7-3.(2x+1)/4
e) 5x + 2/6 – 8x – 1 /3 = 4x + 2 /5 – 5
f) 5x – 4/2 = 16x + 1/7
g) 12x + 5 / 3=2x – 7/4
h) 3t – 8/12 = 5-t /8
i) 5u + 6/15 = u – 4 /10
k) 3.(x-11)/4 = 3. (x+1) – 2.(2x+ 5)/10
l) 14 và 1/2 – 2. (x+3)/5 = 3x/2 – 2. (x-7 )/3
m ) 2x -5 / 6 – x +2 = 5x – 3/ 3 – 6x – 7/ 4 + x
n) x-4/5 + 3x – 2/10 – x = 2x-5/3 – 7x+2/6
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