3^(2a+3) = 7^(a-4).
(2a+3)*Log3 = (a-4)*Log7.
Divide both sides by Log3:
2a+3 = 1.771(a-4).
2a+3 = 1.771a-7.085.
2a-1.77a = -7.085-3.
0.23a = -10.085.
a = -43.85.
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