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log(2x-1)(x+3) = log(10*3)
(2x-1)(x+3) = 30
2x²+5x-3=30
2x²+5x-33=0
(2x+11)(x-3)=0
x=(-11)/2 dan x=3
log(x+3)=log(-11/2 + 3)
jumlah didalam log harus lebih dari 0
maka x=3