(x+6) (x-3)-(x+3)(x+9)=9

Question

(x+6) (x-3)-(x+3)(x+9)=9

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Answer 1

(х+6)x*(х-3)-(х+3)*(х+9)=9
х² -3х+6х-18-(х² +9х+3х+27)=9
х² -3х+6х-18-(х² +12х+27)=9
х² -3х+6х-18-х² -12х-27=9
-9-45=9
-9х=9+45
-9х=54
х=-6

Answer 2

X² - 3x + 6x - 18 - x² -3x - 9x -27 = 9
-9x - 45 = 9

9x = -45 - 9

9x = -54

x = -6

Ответ: -6