question: a plane is given by the equation $\displaystyle \pi=x=60s+2t,y=s+t,z=s+3t$ eliminate s and t and put the equation into the form ax+by+cz=d.

work: $\displaystyle s=\frac{2(y+3)-x}{3}$ and $\displaystyle t=\frac{x+y-6}{3}$ Plug them into original x,y,z equations and solve for x,y,z

problem: I don't know how to combine 3 equations into 1