Equation calculator (linear, quadratic, cubic, linear ... - HackMath
https://www.hackmath.net/en/calculator/solving-system-of-linear-equations
WEBSolving system of linear equations. Write each equation on a new line or separate it by a semicolon. The online calculator solves a system of linear equations (with 1,2,...,n unknowns), quadratic equation with one unknown variable, cubic equation with one unknown variable, and finally, any other equation with one variable.
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