3x-[4x+{x+2x-(3x-4x+x)}]
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Step-by-step explanation:
3x-[4x+{x+2x-(3x-4x+x)}]
=3x-[4x+{x+2x-(0)}]
=3x-[4x+{3x}]
=3x-7x
= -4x
Ans= -4x
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