QUESTION: Math problem: Solve 0*o + 18 = -9*o for o.
ANS: -2
QUESTION: Math problem: Solve -24 = -27*u + 15*u for u.
ANS: 2
QUESTION: Math problem: Solve 69*z + 1118 = 155*z for z.
ANS: 13
QUESTION: Math problem: Solve -158*r + 332*r - 230 = 151*r for r.
ANS:
10