QUESTION: Math problem: Solve 2*b + b = 9 for b.
ANS: 3
QUESTION: Math problem: Solve -y = 20 - 21 for y.
ANS: 1
QUESTION: Math problem: Solve 105*z + 4053 = -8*z - 80*z for z.
ANS: -21
QUESTION: Math problem: Solve -126*d = -440*d + 6280 for d.
ANS:
20