book Maths Puzzle Numerical Ability

Solve for b: 6-3(b+4)=-(2b-6)-(b-1)

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Someone please help me>>>>>>

I need to learn how to simplify the following

(3-sqrt4)*(3+sqrt4)

Thanks a plane flies 465 miles with the wind and 345 miles against the wind in the same length of time. if the speed of the wind is 20 mph, find the speed of the plane in still air.