exam Maths Puzzle Numerical Ability

Solve. 3x - 7 = 2x + 8
my answer is x = 15
Is this correct?

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exam Other Question

In a race , Mary is 50 ft. in front of Susie after 10 seconds. How fast can Mary run if Susie runs 20 ft per second? Find f (-1/3). f(x)=18x2-12x-3