simplfy the expression
9x^2+7-12x-4x^2-15x
To simplify the expression, we can combine like terms.
The given expression is: 9x^2 + 7 - 12x - 4x^2 - 15x.
Combining the terms with x^2, we have: (9x^2 - 4x^2) + 7 - 12x - 15x.
Simplifying the terms with x^2, we have: 5x^2 + 7 - 12x - 15x.
Combining the terms with x, we have: 5x^2 - 12x - 15x + 7.
Combining like terms, we have: 5x^2 - 27x + 7.
The simplified expression is 5x^2 - 27x + 7.