a) 5-{3-[2-(2x(-3)+1+(3-5)]} simplify.
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5-[ 3-{2- (2*(-3) +1)+(3-5)}]
=5-[3-{2-(-6 +1)-2)}]
=5-[3-{2+5-2}]
=5-[3-5]
=5+2=7
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