Question 1019153
The measures of the base angles are congruent for isosceles triangle.
{{{3x+5=5x-25}}}


The sum of the measures of the interior angles for any triangle is 180 degrees.
{{{3x+5+5x-25+6x-10=180}}}


You should first find that x=15 from the first equation; and this MUST agree with the angle sum equation.  The two equations seem to NOT agree!
Angle sum,
{{{14x=180+10+25}}}
{{{14x=215}}}
{{{x=15&5/14}}}


The problem description does not work.