No.
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It's a general reasoning technique. If you can see that x is congruent to y then what goes for y also goes for x. Congruent just means is the same for the properties we are considering at the moment.
If the problem is (5x+1) and your trying to figure out X. The answer is 12. (APEX)
5.3 = 2x so x = 5.3/2 = 2.65
Suppose each base angle is x degrees. Then sum of all three [internal] angles is 180 deg So that 28 + x + x = 180 ie 2x = 152 and then x = 76 deg The length of the congruent sides is irrelevant.