13 2-x=-7 8 July 8, 2019 16 32 64 128 13 2 х 6 8 7 13 7 2 x 8 2x 13 2x 7 8x 4 2x 13 2x 7 8 2x 13 2x 7 8x 4 180 2 x 13 2^x + 8^x = 130
