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If there is exactly one solution for the equation, we ensure that the value of 'x' is an integer. Example 1: Input: equation = "x++x=6+x-2" Output: "x. Distance-rate-time word problems · Mixture word problems · Work word problems · Systems of equations word problems. Exponents. Exponential functions and graphs. For solutions of mathematical optimization problems, see Feasible solution. In mathematics, to solve an equation is to find its solutions, which are the values. Free math problem solver answers your algebra homework questions with step-by-step explanations. Math Exercises & Math Problems: Linear Equations and Inequalities. 1. Solve the linear equations and check the solution.