Question

(x-3)(x+7)-(x+7)(x-8)=0
Прошу помгите
Прошу

Answer 1

(х+7)(х-3-(х-8))=0
х+7=0 или. х-3-х+8=0
х=-7. или. 5≠0
Ответ : -7

Answer 2

$x {}^{2} + 7x - 3x - 21 - (x {}^{2} - 8x + 7x - 56) = 0 \\ x {}^{2} + 7x - 3x - 21 - x {}^{2} + 8x - 7x + 56 = 0 \\ 5x + 35 = 0 \\ 5x = - 35 \\ x = - 7$