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",", B1, ")"). Solving Nonlinear Equations in Excel Nonlinear equations are equations in which the highest power of the variables is greater than 1. For example, the equation (x^2 + y^2 - 1)^3 - x^2*y^3 = 0 is a nonlinear equation. To solve a nonlinear equation in Excel, we can use the SOLVER tool.