( #b + #a ) - #c = {#1}
#a : 2 - #c + #b= {#2}
#b + 3 * ( #a - #c ) = {#3}
#a - (#c + #b : 3) = {#4}
#a - #b - #c = {#5}
]]>
( #b + #a ) - #c = #sol1
#a : 2 - #c + #b= #sol2
#b + 3 * ( #a - #c ) = #sol3
#a - (#c + #b : 3) = #sol4
#a - #b - #c = #sol5
]]>