s+300=3s
how to solve this equation?
$\displaystyle s+300=3s$
First, subtract s from both sides of the equation.
$\displaystyle s+300{\color{red}-s}=3s{\color{red}-s}$
$\displaystyle 300=2s$
Finally, divide both sides of the equation by 2.
$\displaystyle \frac{300}{{\color{red}2}}=\frac{2s}{{\color{red}2 }}$
$\displaystyle 150=s$
$\displaystyle \boxed{s=150}$