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-- If the equation has only one variable (like 'x' or 'y'), and the only power of the

variable anywhere in the equation is '1', then the equation has one solution.

-- If the variable appears raised to powers higher than '1', then there are as many

solutions as the highest power of the variable.

-- If the equation has two or more variables, then there are an infinite number of solutions.

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Q: Does an equation have one true solution?
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