1.X=-5/13
2.X=131/491
3.X=2008
1.2x-0.5x+0.25(x-1)=2/3(x-1)
7/4x-2/3x=1/4-2/3
21x-8x=3-8
13x=-5
x=-13/5
2.90-400x-39+9x=100x-80
491x=131
x=131/491
3.x-1/2x+1/2x-1/3x+1/3x-1/4x+1/4x-1/5x.+1/2007x-1/2008x=2007
x-1/2008x=2007
2007/2008x=2007
x=2008
x
1.X=-5/13
2.X=131/491
3.X=2008
1.2x-0.5x+0.25(x-1)=2/3(x-1)
7/4x-2/3x=1/4-2/3
21x-8x=3-8
13x=-5
x=-13/5
2.90-400x-39+9x=100x-80
491x=131
x=131/491
3.x-1/2x+1/2x-1/3x+1/3x-1/4x+1/4x-1/5x.+1/2007x-1/2008x=2007
x-1/2008x=2007
2007/2008x=2007
x=2008
x