Question 1130242
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Each of the two base angles has the measure of  {{{(180^o-35^o)/2}}} = {{{145^o/2}}} = 72.5° degrees = 72 degrees and 30 minutes = 72° 30'.


It is based on two facts:

    a)  the sum of a triangle interior angles is 180°,    and

    b)  in isosceles triangle the base angles are congruent.
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<U>Aside notice</U>:  &nbsp;&nbsp;If one base angle is &nbsp;(x+5)&nbsp; degrees, &nbsp;then the other base angle has &nbsp;THE SAME &nbsp;degree measure of &nbsp;(x+5).


The formulation in your post is slightly illogical / (allogical).