\(541+\left(218-x\right)=73\)
\(218-x=73-541\)
\(218-x=-468\)
\(x=218--468=218+468\)
\(x=686\)
\(218-x=73-541\\ =>218-x=-468\\ =>x=218-\left(-468\right)\\ =>x=686\)
541 + ( 218 − x ) = 73
<=> 218 − x = 73 − 541
<=>218 − x = − 468
<=> x = 218 + 468 = 218 + 468
<=> x = 686