Question 902917
Are the angles supplementary or complementary?
If they're supplementary,
{{{7x+12+3x+40=180}}}
{{{10x+52=180}}}
{{{10x=128}}}
{{{x=128/5}}}
{{{x=64/5}}}
Now go back and plug in x to find FBE.
If they're complementary,
{{{10x+52=90}}}
{{{10x=38}}}
{{{x=38/10}}}
{{{x=19/5}}}
Similarly go back and plug in x to find FBE.