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).

Ex Input:
Let q = 11 + -7. Let o(n) = -n**3 + 11*n**2 + 12*n + 3. Let v be o(12). Let w(f) = -f**2 + 6*f - 4. Let i be w(4). Solve -v*l = -i*l + q for l.

Ex Output:
4


Ex Input:
(-4 - 0) + 0 + 10 + -6

Ex Output:
0


Ex Input:
Suppose 4 - 1 = 3*p + 5*n, -3*n - 9 = 0. Let d(c) = c**2 - 6*c. Let m be d(p). Suppose 2*q - 23 = b, m = -0*q + 4*q + 3*b - 21. What is the units digit of q?

Ex Output:

9