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Move everything to the left hand side of the equation
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$\left(a+b\right)\left(a-b\right)-a^2+b^2=0$
Learn how to solve equations problems step by step online. Solve the equation (a+b)(a-b)=a^2-b^2. Move everything to the left hand side of the equation. Multiply the single term a-b by each term of the polynomial \left(a+b\right). Multiply the single term a by each term of the polynomial \left(a-b\right). Cancel like terms a^2 and -a^2.