What common base can be used to rewrite each side of the equation 2x+- 3-5?

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Ifigured out the question and i dont know what to put here

Ineed with angles and the measure of them i have abc a is 65 and b is (3x-10) and c is (2x) find the value of x

To prove that angle def = angle dgf by sas, what additional information is needed? def congruent to dgf dfe congruent to dfg de congruent to dg dg congruent to gf