Question 764601


{{{-(a-3b+x-y)=-a+3b-x+y}}}


evaluate {{{5a+3a}}} when {{{a=3}}}

{{{5a+3a=5*3+3*3=15+9=24}}}


{{{1/2(4x+2y-z)=4x/2+2y/2-z/2=2x+y-z/2}}}