Question

Sx+tx=r How to solve?

Answer 1

Solve for x.

sx+tx=r

Factor out variable x.

x(s+t)=r

Divide both sides by s+t.

$\sf \dfrac{x(s+t)}{s + t} = \dfrac{r}{s + t} \\ \\ \\ \huge{\boxed{x =\dfrac{r}{s + t}}}$