-18
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-8
8 feet, 10 inches
3 6 4 8 6 12 10 20 18 36 34 68 Multiply 3 by 2 to get 6 Subtract 2 to get 4 Multiply 4 by 2 to get 8 Subtract 2 to get 6 Multiply 6 by 2 to get 12 Subtract 2 to get 10 .... Got it?
2x+8=10... Subtract 8 on both sides, then devide by 2... 2x=2... x=1
Subtract two, multiply by two, subtract one. :)