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x^{2}+x-42=\left(x+3\right)\left(x-11\right)
Use the distributive property to multiply x-6 by x+7 and combine like terms.
x^{2}+x-42=x^{2}-8x-33
Use the distributive property to multiply x+3 by x-11 and combine like terms.
x^{2}+x-42-x^{2}=-8x-33
Subtract x^{2} from both sides.
x-42=-8x-33
Combine x^{2} and -x^{2} to get 0.
x-42+8x=-33
Add 8x to both sides.
9x-42=-33
Combine x and 8x to get 9x.
9x=-33+42
Add 42 to both sides.
9x=9
Add -33 and 42 to get 9.
x=\frac{9}{9}
Divide both sides by 9.
x=1
Divide 9 by 9 to get 1.