Question 1089377

{{{D-25=78}}}...here, you have unknown variable {{{D}}} and you need to find what is {{{D}}} equal to

first add {{{25}}} to both sides

{{{D-25+25=78+25}}}

{{{D-cross(25)+cross(25)=78+25}}}

{{{D=78+25}}}...now we have {{{D}}} on one side and {{{78+25}}}(add them)

{{{D=103}}}