7bm-7am=7m(b-a)
b-a=-(a-b)=-4 , m=-5
7m(b-a)=7.(-5).(-4)=-35.(-4)=140
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7bm-7am=7m(b-a)
b-a=-(a-b)=-4 , m=-5
7m(b-a)=7.(-5).(-4)=-35.(-4)=140