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log (2x - 1)(x + 3) = log 10 + log 3
log 2x² + 5x - 3 = log 30
2x² + 5x - 3 = 30
2x² +5x - 33 = 0
(2x + 11)(x - 3) = 0
2x + 11 = 0 atau x - 3 = 0
x = -11/2 atau x = 3