Question 1088551

{{{7b - 2a }}} 
when {{{a=-3}}} and {{{b=4}}}, you just substitute  {{{-3}}} for {{{a}}}, and {{{4}}} for {{{b}}}

{{{7b - 2a =7*4 - 2(-3) }}} 

{{{7b - 2a =28 + 6 }}} 

{{{7b - 2a =34 }}}