2a-[4y-{7x-(3b-2q+2b)}]
pls show the calculation
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=2a-[4y-{7x-3b+2q-2b}]
=2a-(4y-7x+3b-2q+2b)
=2a-4y+7x-3b+2q-2b
If you want to factorise then,
2(a-b)•-2(2y-q)•(7x-3b)
-4(a-b)(2y-q)(7x-3b)
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