Question 834889
Rate for the trip going was r.


____________speed_____________time___________distance_____Equation?
Going_______r_________________7______________d___________{{{r*7=d}}}
ToHome______r+12______________5______________d___________{{{(r+12)*5=d}}}


One neat way to solve for d is use the Going equation and solve it for r; and substitute into the ToHome equation, and then finish solving for and simplifying for d.