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\left(x+1\right)x+\left(x-1\right)\left(x+1\right)\left(-1\right)=1
Variable x cannot be equal to any of the values -1,1 since division by zero is not defined. Multiply both sides of the equation by \left(x-1\right)\left(x+1\right), the least common multiple of x-1,\left(x-1\right)\left(x+1\right).
x^{2}+x+\left(x-1\right)\left(x+1\right)\left(-1\right)=1
Use the distributive property to multiply x+1 by x.
x^{2}+x+\left(x^{2}-1\right)\left(-1\right)=1
Use the distributive property to multiply x-1 by x+1 and combine like terms.
x^{2}+x-x^{2}+1=1
Use the distributive property to multiply x^{2}-1 by -1.
x+1=1
Combine x^{2} and -x^{2} to get 0.
x=1-1
Subtract 1 from both sides.
x=0
Subtract 1 from 1 to get 0.