Question 1000280
Those not being the right angle nor part of the right angle, are complementary.  Why?  sum of interior angles of any triangle are 180 degrees, and the other angle in your triangle is 90 degrees.


{{{10x-5+4x+7=90}}}

{{{14x=88}}}

{{{7x=44}}}

{{{highlight(x=6&2/7)}}}