- 3/x-2+7/x+2=10/x x≠2,-2,0
3(x+2)+7(x-3)/(x-2)(x+2) =10/x
3x+6+7x-14/x2-4=10/x
10x-8/x2-4=10/x
10x2-40=10x2-8x
-8x+40=0
8x=40
x=5
2) 7/x-3-10/x+1=15/x-1
7x+7-10x+30/(x-3)(x+1)=15/x-1
-3x+37/x2-2x-3=15/-x-1
(x-1)(-3x+37)=15(x2-2x-3)
18x2-70x-8=0
9x2-35x-4=0
D= 372
x1=35+37/18=4
x2=35-37/18=-1/9