Simplest form 5a+[3b-(-2a+4b)]

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5a + [3b -(-2a + 4b)]

first you need to distribute the negative(-) sign in the @s enclose in parenthesis.
5a + [3b +2a - 4b)]
then combine like terms
5a +[2a -b]

then distribute the positive sign(+)
5a + 2a - b

then lastly, combine like terms
7a - b ======> this is the final answer in simplifying that kind of equation


hope this helps