3^(x+1) - 3^(x-3) = 24
3^x * 3^1 - 3^x * 3^-3 = 24
3^x * 3 - 3^x * 1/27 = 24 /*27
3^x * 81 -3^x = 648
3^x * (81-1) = 648
3^x * 80 = 648 /:80
3^x = 81/10
log3 81/10 = x <--- odp.
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3^(x+1) - 3^(x-3) = 24
3^x * 3^1 - 3^x * 3^-3 = 24
3^x * 3 - 3^x * 1/27 = 24 /*27
3^x * 81 -3^x = 648
3^x * (81-1) = 648
3^x * 80 = 648 /:80
3^x = 81/10
log3 81/10 = x <--- odp.