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).

Example Input: Suppose -3 = -j - 4. Let h be j + 0 + (4 - 3). What is the units digit of h - -1 - 6*-1?
Example Output: 7

Example Input: What is the product of -4 and -42?
Example Output: 168

Example Input: Convert 672557.7 litres to millilitres.
Example Output:
672557700