Question 394489


{{{x+12/x=7}}}...both sides multiply by {{{x}}}

{{{x*x +(12/x)x = 7x}}}


{{{x*x +(12/cross(x))cross(x) = 7x}}}


{{{x^2 +12 = 7x}}}...add {{{-7x}}} to both sides


{{{x^2  -7x +12  = 7x - 7x}}}


{{{x^2  -7x +12  = 0}}}...use quadratic formula

*[invoke quadratic_formula 1, -7, 12, "x"]