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Addition and Subtraction of Algebraic Expressions [Pending...]

My question

simplify −3[−5(m − 2n) + 4n] + `sqrt(4n)`

Relevant page

1. Addition and Subtraction of Algebraic Expressions

What I've done so far

−3[−5(m − 2n) + 4n] + `sqrt(4n)`
=-3[-5m+10n+4n]+`sqrt(4n)`
=-15m-30n-12n +`sqrt(4n)`

X

simplify −3[−5(m − 2n) + 4n] +  `sqrt(4n)`
Relevant page

<a href="/basic-algebra/1-addition-subtraction-algebra.php">1. Addition and Subtraction of Algebraic Expressions</a>

What I've done so far

−3[−5(m − 2n) + 4n] +  `sqrt(4n)`
=-3[-5m+10n+4n]+`sqrt(4n)`
=-15m-30n-12n +`sqrt(4n)`

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