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

Предыдущий
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вопрос

Let's expand the expression on the left side of the equation:

(X + 6)(X - 3) - (X + 3)(X + 9)
= X^2 - 3X + 6X - 18 - (X^2 + 9X + 3X + 27)
= X^2 + 3X - 18 - X^2 - 12X - 27
= -9X - 45

Now, the equation becomes:

-9X - 45 = 9

To solve for X, add 45 to both sides:

-9X = 54

Then, divide by -9:

X = -6

Therefore, the solution to the equation is X = -6.