exam Maths Puzzle Numerical Ability

I dont understand how to solve problems such as this....
5x-16=3x

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exam Other Question

Find A ∩ B if A = {4, 7, 10, 13, 17} and B = {3, 5, 7, 9}. A baseball is hit off atee 2ft tall with a velosity of 3ft per sec. use h=-16t+vt+s to determine the time it well take to hit the ground