3( х -1)^2-3х(х-5)=21

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вопрос

To solve the given equation, we first need to expand and simplify the left side of the equation.

Expanding the equation:
3(x - 1)^2 - 3x(x - 5) = 21
3(x^2 - 2x + 1) - 3x^2 + 15x = 21
3x^2 - 6x + 3 - 3x^2 + 15x = 21
9x - 3 = 21

Now we can solve for x:
9x - 3 = 21
9x = 24
x = 24/9
x = 8/3

Therefore, the solution to the equation is x = 8/3.