What is 12+5x=2x-9 step by step

  x = -7

How to:

Rearrange the equation by subtracting what is to the right of the equal sign from both sides of the equation

5°x-(2°x-9)=0

Pull out like factors:

21 + 3x  =   3 • (x + 7)

Equations which are never true:  Solve 3   =  0

Solving a Single Variable Equation:

Solve  :    x+7 = 0

Subtract  7  from both sides of the equation : x = -7

can you rephrase the question ? it is unclear : -)

step-by-step explanation: