(m+4)/(5m-10) + (3-m)/(4m-8)=(m+4)/5(m-2) + (3-m)/4(m-2)=
=(4(m+4)+5(3-m))/20(m-2)=(4m+16+15-5m)/20(m-2)=
=(31-m)/(20m-40)
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(m+4)/(5m-10) + (3-m)/(4m-8)=(m+4)/5(m-2) + (3-m)/4(m-2)=
=(4(m+4)+5(3-m))/20(m-2)=(4m+16+15-5m)/20(m-2)=
=(31-m)/(20m-40)