exam Maths Puzzle Numerical Ability

Problem: Solve by factoring... 7X(X-1)=1-X

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3x to the 2nd power + 17 = 33 + 7x 2nd power It takes the earth 1.0 years to travel around the sun. It takes Venus 0.615 years to orbit the sun. If the planets are in a straight line with the sun now, how long will it take before this is the case again?