Question 667124
Starting with
{{{(2x-a)/b = (2x-b)/a}}}
...
{{{cross(b)(2x-a)/cross(b) = ((2x-b)/a)(b)}}}
...
{{{2x-a = (b(2x-b)/a)}}}
{{{a(2x-a) = (b(2x-b)/cross(a))(cross(a))}}}
...
{{{a(2x-a)= b(2x-b)}}}
{{{2ax - a^2 = 2bx - b^2}}}
...
{{{2ax - 2bx = a^2 - b^2}}}
{{{x(2a-2b) = a^2 - b^2}}}
...
{{{x(cross(2a-2b))/(cross(2a-2b)) = (a^2 - b^2)/(2a-2b)}}}
{{{highlight_green(x = (a^2 - b^2)/(2a-2b))}}}
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