((х+3)²+(х-3)²) / (х+3)*(х-3)=3 1/3
3*((х+3)²+(х-3)²) / ((х+3)*(х-3))*3= 10((х+3)*(х-3))*/3*((х+3)*(х-3))
3*(х²+6х+9+х²-6х+9) /( х²-9)*3= 10*(х²-9)/ 3*(х²-9)
6х²+54 = 10х²-90
4х²=144
х²=144:4
х²=36
х₁=6
х₂= -6
((5х+7)*(х+2)-(2х+21)*(х-2)) /(х-2)*(х+2)=8 2/3
5х²+7х+10х+14-(2х²+21х-4х-42) /(х²-4)=26/3
3*(5х²+17х+14-2х²-17х+42) /3*(х²-4)=26*(х²-4)/3*(х²-4)
3*(3х²+56) =26*(х²-4)
9х²+168=26х²-104
17х²=272
х²=272 :17
х²=16
х₁=4
х₂= -4