Expand the following: \begin{align} F_G+F_b+N=ma =&\cssId{Step1}{-F_b=ma}\\[3px] &\cssId{Step2}{N-F_G=0}\\[3px] &\cssId{Step3}{a= -\frac{F_b}{m}}\\[3px] \end{align}

- In the first step we make the equation of the force breaking with mass and acceleration
- In the seconde step we make the equation of normal force and the gravity force
- In the third step we make the equation of accelation with Force breaking and mass