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3x+2+x^{2}=\left(3+2x\right)\left(x-1\right)-1\left(x-1\right)\left(x+1\right)
Use the distributive property to multiply 2+x by x+1 and combine like terms.
3x+2+x^{2}=x-3+2x^{2}-1\left(x-1\right)\left(x+1\right)
Use the distributive property to multiply 3+2x by x-1 and combine like terms.
3x+2+x^{2}+1\left(x-1\right)\left(x+1\right)=x-3+2x^{2}
Add 1\left(x-1\right)\left(x+1\right) to both sides.
3x+2+x^{2}+\left(x-1\right)\left(x+1\right)=x-3+2x^{2}
Use the distributive property to multiply 1 by x-1.
3x+2+x^{2}+x^{2}-1=x-3+2x^{2}
Consider \left(x-1\right)\left(x+1\right). Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}. Square 1.
3x+2+2x^{2}-1=x-3+2x^{2}
Combine x^{2} and x^{2} to get 2x^{2}.
3x+1+2x^{2}=x-3+2x^{2}
Subtract 1 from 2 to get 1.
3x+1+2x^{2}-x=-3+2x^{2}
Subtract x from both sides.
2x+1+2x^{2}=-3+2x^{2}
Combine 3x and -x to get 2x.
2x+1+2x^{2}-2x^{2}=-3
Subtract 2x^{2} from both sides.
2x+1=-3
Combine 2x^{2} and -2x^{2} to get 0.
2x=-3-1
Subtract 1 from both sides.
2x=-4
Subtract 1 from -3 to get -4.
x=\frac{-4}{2}
Divide both sides by 2.
x=-2
Divide -4 by 2 to get -2.