Question 342020
{{{A+C=90}}}
.
.
{{{A=3x-10}}}
{{{C=2x+20}}}
.
.
{{{3x-10+2x+20=90}}}
{{{5x=80}}}
{{{highlight(x=16)}}}
.
.
{{{A=3(16)-10}}}
{{{A=48-10}}}
{{{highlight_green(A=38)}}}
.
.
.
{{{C=2(16)+20}}}
{{{C=32+20}}}
{{{highlight_green(C=52)}}}