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2M+3N-2X-6Y+5S= 2(6)+3(3)-2(2)-6(5)+5(4)
= 12+9-4-30+20
=7
4Y*5X =4(5)*5(2)
= 20*10
= 200
=2×3×2×5×4×5×5×2=12
6+5+4=15
-2-6=-8