book Maths Puzzle Numerical Ability

Solve for x in these equations. Verify the solutions.

18-(x+3)-2x=4+(x-5)

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book Other Question

My problem:
A plane flies 400 miles with the wind and 320 miles against the wind in the same length of time. If the speed of the wind is 20 mph, whqat is the speed of the plane in still air? (5-y)+(6-y)-(5-y)=0 what does y equal???