If the solutions of the equation 5x + 12 = 4A of X are all negative, then the value range of a is () A. a>3B. a<-3C. a<3D. a>-3

If the solutions of the equation 5x + 12 = 4A of X are all negative, then the value range of a is () A. a>3B. a<-3C. a<3D. a>-3

Solve the equation about X: x = 4A − 125, according to the meaning: 4A − 125 < 0, the solution is a < 3