[3x(2-4)-5]x(-2)-[15+3x(-4)-(-6+2)]+5
$[3×(2-4)-5]×(-2)-[15+3×(-4)-(-6+2)]+5 =$
$= [3×(-2)-5]×(-2)-[15-12-(-4)]+5 =$
$= [-6-5]×(-2)-[3+4]+5 =$
$= [-11]×(-2)-[+7]+5 =$
$= 22-7+5 =$
$=20$
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