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x^{2}+3x-18=\left(x-4\right)\left(x-5\right)
Use the distributive property to multiply x-3 by x+6 and combine like terms.
x^{2}+3x-18=x^{2}-9x+20
Use the distributive property to multiply x-4 by x-5 and combine like terms.
x^{2}+3x-18-x^{2}=-9x+20
Subtract x^{2} from both sides.
3x-18=-9x+20
Combine x^{2} and -x^{2} to get 0.
3x-18+9x=20
Add 9x to both sides.
12x-18=20
Combine 3x and 9x to get 12x.
12x=20+18
Add 18 to both sides.
12x=38
Add 20 and 18 to get 38.
x=\frac{38}{12}
Divide both sides by 12.
x=\frac{19}{6}
Reduce the fraction \frac{38}{12} to lowest terms by extracting and canceling out 2.