Question 919083
{{{5x+2y=7x}}} because these base angle measures must be equal.
{{{2y=2x}}}
{{{highlight_green(y=x)}}}


Vertex angle of 36 means {{{x+x+36=180}}}, using also substitution
{{{2x+36=180}}}
{{{x+18=90}}}
{{{highlight(x=72)}}}