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\left(x+1\right)x+x+1-4=\left(x+1\right)x+\left(x+1\right)\left(-1\right)
Variable x cannot be equal to -1 since division by zero is not defined. Multiply both sides of the equation by x+1.
x^{2}+x+x+1-4=\left(x+1\right)x+\left(x+1\right)\left(-1\right)
Use the distributive property to multiply x+1 by x.
x^{2}+2x+1-4=\left(x+1\right)x+\left(x+1\right)\left(-1\right)
Combine x and x to get 2x.
x^{2}+2x-3=\left(x+1\right)x+\left(x+1\right)\left(-1\right)
Subtract 4 from 1 to get -3.
x^{2}+2x-3=x^{2}+x+\left(x+1\right)\left(-1\right)
Use the distributive property to multiply x+1 by x.
x^{2}+2x-3=x^{2}+x-x-1
Use the distributive property to multiply x+1 by -1.
x^{2}+2x-3=x^{2}-1
Combine x and -x to get 0.
x^{2}+2x-3-x^{2}=-1
Subtract x^{2} from both sides.
2x-3=-1
Combine x^{2} and -x^{2} to get 0.
2x=-1+3
Add 3 to both sides.
2x=2
Add -1 and 3 to get 2.
x=\frac{2}{2}
Divide both sides by 2.
x=1
Divide 2 by 2 to get 1.