Convert a list of strings of the form {{2 "x"+"y"->4 "x"+ 5"y"},{5 "x" ->7"y"}, ...}, to {{"2 x +y"->"4 x +5 y"},{"5 x" ->"7 y"},...}

Convert a list of strings of the form

{{2 "x" +"y"->4 "x" + 5"y"},{5 "x" ->7"y"}, ...}

to

{{"2 x +y"->"4 x +5 y"},{"5 x" ->"7 y"},...}

This maybe a necessary step for the more difficult question Draw a graph on vertices inputted as "A"+ 2 "B", 3"A" + 4"B", etc (the input form is imposed) in Euclidean space, with A->(1,0), B->(0,1)