exam Maths Puzzle Numerical Ability

x+7/6=2x-7/6

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exam Other Question

Find the length of a simple iterest loan with P = $640, r = 8.5%, and I = $95.20. (3+4 radical sign 6)(-5-2 radical sign 6) Please help me simplify.
I came up with -63-26 radical sign 6
Can someone tell me if this is correct or where I went wrong?