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log (3x²-7x) =log 10
(3x²-7x) =10
3x² - 7x -10 = 0
(x+1)(3x-10) = 0
x+1 = 0 atau 3x-10 = 0
x = -1 atau x = 10/3
log(3x^2 - 7x) = log10
3x^2 - 7x - 10 = 0
(3x - 10) (x + 1) = 0
x1 = 10/3 atau x2 = -1