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12x-9x^{2}-4-2x+1=9\left(2x-x^{2}\right)+4-\left(x+3\right)
Use the distributive property to multiply 3x-2 by 2-3x and combine like terms.
10x-9x^{2}-4+1=9\left(2x-x^{2}\right)+4-\left(x+3\right)
Combine 12x and -2x to get 10x.
10x-9x^{2}-3=9\left(2x-x^{2}\right)+4-\left(x+3\right)
Add -4 and 1 to get -3.
10x-9x^{2}-3=18x-9x^{2}+4-\left(x+3\right)
Use the distributive property to multiply 9 by 2x-x^{2}.
10x-9x^{2}-3=18x-9x^{2}+4-x-3
To find the opposite of x+3, find the opposite of each term.
10x-9x^{2}-3=17x-9x^{2}+4-3
Combine 18x and -x to get 17x.
10x-9x^{2}-3=17x-9x^{2}+1
Subtract 3 from 4 to get 1.
10x-9x^{2}-3-17x=-9x^{2}+1
Subtract 17x from both sides.
-7x-9x^{2}-3=-9x^{2}+1
Combine 10x and -17x to get -7x.
-7x-9x^{2}-3+9x^{2}=1
Add 9x^{2} to both sides.
-7x-3=1
Combine -9x^{2} and 9x^{2} to get 0.
-7x=1+3
Add 3 to both sides.
-7x=4
Add 1 and 3 to get 4.
x=\frac{4}{-7}
Divide both sides by -7.
x=-\frac{4}{7}
Fraction \frac{4}{-7} can be rewritten as -\frac{4}{7} by extracting the negative sign.