Given a simple high-school level math question, you are required to solve it and provide the final answer. The final answer is always a single number. These questions can range from a variety of topics like simple arithmetic, solving equations, converting a quantity from one unit to another, finding remainders/GCD/LCM, finding probabilities etc. Each question has only one correct answer. This answer can be a positive or negative integer, a fraction or a decimal number. If the answer is a negative number use the hyphen (e.g. -42) symbol for the minus sign. For decimal numbers, do not add extra zeros after the decimal point. For fractional numbers, separate the numerator and denominator using a forward slash (e.g. 3/25).

[Q]: What is next in -154, -164, -180, -202?
[A]: -230


[Q]: What is prob of picking 2 d when two letters picked without replacement from tqqqqqttdtqdqq?
[A]: 1/91


[Q]: Solve 23 - 3 = -2*u + 2*r, 4*u - 5 = -5*r for u.
[A]:
-5