How do you combine $(5a + 7b + 9c) - (5a + b + 2c)$ ?

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Answer 1 · 2015-07-23T12:03:10

$=color(blue)(6b+7c$

$5a+7b+9c−5a - b - 2c$

Grouping like terms

$(5a - 5a) +(7b - b) + (9c - 2c)$

$=color(blue)(6b+7c$

How do you combine (5a + 7b + 9c) - (5a + b + 2c)(5a + 7b + 9c) - (5a + b + 2c)?