ii) 7x - [5y - {3x - (-x-2y)}]
v) m2 - [n? - {3m² - (n2 - 2m- 3n)}]
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ii) 7x-[5y-{3x-(-x-2y)}]
=7x-[5y-{3x+X+2y}]
=7x-[5y-3x-x-2y]
=7x-5y+3x+X+2y
=11x-3y..... ans
v) m2-[n-{3m2-(n2-2m+3n)}]
=m2-[n-{3m2-n2+2m+3n}]
=m2-[n-3m2+n2-2m-3n]
=m2-n+3m2-n2+2m+3n
=4m2+2n-n2+2m... ans
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