giải các phương trình sau: a)5(x-3)-4=2(x-1)=7 b)4(3x-2)-3(x-4)=7x+20 c)x/2-2x+1/3=2x-1/5 d)3(3-x)/8+2(5-x)/3=1-x/2-2

a)5(x-3)-4=2(x-1)-7

⇔5x-15=2x-2-7

⇔5x+2x=-9+15

⇔7x=6

⇔x=6/7

b)4(3x-2)-3(x-4)=7x+20

⇔12x-8-3x+12=7x+20

⇔11x-7x=20-4

⇔4x=16

⇔x=4

c)x/2-2x+1/3=2x-1/5

⇔15x-60+10=60x-6

⇔15x=56

⇔x=56/15