Question: re orient positive terms to the front

Mainly just symantics, Maple often shifts -'ve terms to the front, how to re-orient terms so the positive terms are always first?

a:= (a2b1-a1b2)*j1+(a4b4-a3b5)*j2

                           ( - a1b2 + a2b1) * j1 + ( - a3b5 + a4b4) * j2

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