(8х+14)/(х-5)-(х-7)/(х+5)=0
(8х+14)×(х+5)-(х-7)×(х-5)/(х-5)×(х+5)=0
€- знак не равно
~-знак примерно равно
(х-5)×(х+5)€0
х-5€0
х€5
х+5€0
х€-5
(8х+14)(х+5)-(х-7)(х -5)=0
8х²+14x+40x+70-(х²-7x-5х+35)=0
8х²+54х+70-х²+12х-35=0
7х²+66х+35=0
D=(-66)²-4×7×35=4356-980=3376
x1=(-66-√3376)/2×7=(-66-58,1)/14=-124,1/14~-8,864
х2=(-66+√3376)/2×7=(-66+58,1)/14=-7,897/14~-0,564