Well, isn't that a happy little math problem we have here! To find 2 times 17, you simply multiply 2 by 17. So, 2 times 17 equals 34. Just like painting a beautiful landscape, sometimes all it takes is a gentle brushstroke to reveal the true beauty of numbers.
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It could be: 2(x-8.5) = 2x-17
2x+17=6x-23 23+17=6x-2x 40=4x x=40 / 4 therefore x=10
12x-3=2x+17 10x-3=17 10x=20 x=2
2x = 17 then x = 8.5 2x+1=7 then x = 3 2x - 1 = 7 then x = 4 which is your problem
x=12