Question 1129729

{{{72 - (-4x)}}}-> first get rid of parentheses {{{(-4x)}}}

in front of  parentheses you have a minus sign which means all in  parentheses multiply by {{{-1}}}

{{{72 - 1*(-4x)}}} -> recall the rule: minus times minus = plus, so you have

{{{72+4x}}}  and the coefficient in the expression is {{{4}}}