1/2(1-x)=1+k
(1-x)=2+2k
x=1-(2+2k)
x=-1-2k..............(1)
3/4(x-1)-3/5(3x+2)=1/10k-3/2(x-1)
9/4(x-1)-3/5(3x+2)=1/10k
45(x-1)-8(3x+2)=2k (两边同乘以20)
45x-45-24x-16=2k
21x=2k+61
x=1/21(2k+61)........(2)
(1)+(2)=0得:
1/21(2k+61)-1-2k=0
2k+61-21-42k=0 (两边同乘以21)
40-40k=0
k=1