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A.^7log(2x-1)+^7log(x+3)=7 log 15
^7log(2x-1)(x+3)=^7log15
(2x-1)(x+3)=15
2x²+6x-x-3=15
2x²+5x-3-15
2x²+5x-18=0
(2x+9)(x-2)
2x=9
x=9/2
x=2
B.^3log(x-2)+^3log(x+4)=3
hint
(x-2)(x+4)=3³
x²+2x-8=27
x²+2x-8-27=0
x²-2x-35=0
(x-7)(x-5)
x=7 atau x=5