QUESTION: Math problem: Solve 4*a - 21 = -1 for a.
ANS: 5
QUESTION: Math problem: Solve -9*j + 8 + 37 = 0 for j.
ANS: 5
QUESTION: Math problem: Solve 3*z = z - 0*z for z.
ANS: 0
QUESTION: Math problem: Solve -650 = -6162*a + 6149*a for a.
ANS:
50