Уровнение (x-3)^2-(x+10)^2=12

Question

Уровнение
(x-3)^2-(x+10)^2=12

Answer 1

(x-3-x-10)(x-3+x+10)=12
-13(2x+7)=12
2x+7=-12/13
2x=-12/13-7
2x=-(12+7*13)/13
x=-(12+7*13)/26=-103/26
Ответ: -103/26

Answer 2

(х-3)²-(х+10)²=12
х²-6х+9-(х²+20х+100)=12
х²-6х+9-х²-20х-100=12
-26-91=12
-26х=12+91
-26х=103
х=-103/26