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\left(x-2\right)\left(x-1\right)-\left(x+1\right)\left(x+2\right)=0
Variable x cannot be equal to any of the values -1,2 since division by zero is not defined. Multiply both sides of the equation by \left(x-2\right)\left(x+1\right), the least common multiple of x+1,x-2.
x^{2}-3x+2-\left(x+1\right)\left(x+2\right)=0
Use the distributive property to multiply x-2 by x-1 and combine like terms.
x^{2}-3x+2-\left(x^{2}+3x+2\right)=0
Use the distributive property to multiply x+1 by x+2 and combine like terms.
x^{2}-3x+2-x^{2}-3x-2=0
To find the opposite of x^{2}+3x+2, find the opposite of each term.
-3x+2-3x-2=0
Combine x^{2} and -x^{2} to get 0.
-6x+2-2=0
Combine -3x and -3x to get -6x.
-6x=0
Subtract 2 from 2 to get 0.
x=0
Product of two numbers is equal to 0 if at least one of them is 0. Since -6 is not equal to 0, x must be equal to 0.