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).

Suppose -4*y + 19 - 3 = 0. Suppose 16 = -0*b + y*b. Calculate the lowest common multiple of b and 10.
20

What is next in 30, 29, 26, 21, 14, 5?
-6

Let d = -24 - -38. What is the tens digit of d?

1