isosceles triangel question: 3x + 10degree in at 1 angle then the opposite angle is 5x - 10 degree. Can you show how to get the answer?

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If these angles are at the base of the triangle, i.e. each is touching only one of the congruent sides, then you just set these equations equal to each other. 3x+10 = 5x-10 --> 20 = 2x --> 10 = x. If one of the angles is at the apex of the triangle, then we would say 180 = 2a+b, where a is the equation of the base angle and b is the equation of the apex angle.