Remove the symbols of grouping (i.e., brackets, braces, parentheses) and collect terms: $21 a^{2}+2 b^{2}-$ $6\left(a b+3 a^{2}-5 b^{2}\right)$

Name: Remove the symbols of grouping (i.e., brackets, braces, parentheses) and collect terms: $21 a^{2}+2 b^{2}-$ $6\left(a b+3 a^{2}-5 b^{2}\right)$
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The Answer of Remove the symbols of grouping (i.e., brackets, braces, parentheses) and collect terms: $21 a^{2}+2 b^{2}-$ $6\left(a b+3 a^{2}-5 b^{2}\right)$

Remove the Symbols of Grouping (I 21a2+2b2−21 a^{2}+2 b^{2}-21a2+2b2− 6(ab+3a2−5b2)6\left(a b+3 a^{2}-5 b^{2}\right)6(ab+3a2−5b2)

Remove the Symbols of Grouping (I $21 a^{2}+2 b^{2}-$ $6\left(a b+3 a^{2}-5 b^{2}\right)$