Question 936803
{{{0.5x+78.2=287}}} so

{{{287-78.2=0.5x}}}

{{{209.8=0.5x}}} Multiply each side by 2 and you get

{{{highlight(x=419.6)}}} Check: {{{419.6/2=214.8}}} {{{209.8+78.2=287}}} {{{287=287}}}