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log_a in (-oo:+oo)
log_a^49 = 2/3 // - 2/3
log_a^49-(2/3) = 0
log_a^49-2/3 = 0
1*log_a^49 = 2/3 // : 1
log_a^49 = 2/3
log_a^49 = 2/3 // ^ 1/49
log_a = (2/3)^(1/49)
log_a = (2/3)^(1/49)
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