exam Maths Puzzle Numerical Ability

solve and check
3x - 7 = 2x + 8

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exam Other Question

Telephoto Lens. Use the formula 1 / f = 1 / o + 1 / i to find the image distance i for an object that is 2,000,000 mm from a 250-mm telephoto lens. Solve the system by addition or substitution.
-4x + 2y = -12
y = 2x - 7