AB + BC = AC
(8x - 4) + (9x + 17) = 10x + 34
...simplify
17x + 13 = 10x + 34
...subtract 13
17x = 10x + 21
...subtract 10x
7x = 21
...divide 7
x = 3
AC = 10(3) + 34 = 30 + 34
AC = 64
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