exam Maths Puzzle Numerical Ability

I am stuck on correct answer for:

if x - 2/7 x = 5, then x =

I believe answer is "7" but I need to verify my work. Can you show me the breakdown to get correct resolve?

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exam Other Question

Simplify: 16x^2+8x+1/1 - 16x^2 Technology: Driving down a moutain, Tom finds he has descended 1800 ft in elevation by the time he is 3.25 mi horizontally away from the top of the mountain. Find the slope of his descent to the nearest hundredths.