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1 Answer

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(21x)-(-16+7xt)=14x+16
Steps
(21x)-(-16+7x)
Remove Parentheses
=21x-(-16+7x)
-(-16+7x): 16-7x
=21x+16-7x
Simplify: 21x+16-7x:\quad 14x+16
21x+16-7x
Group like terms: 21x-7x+16
add similar elements: 21x-7x=14x: =14x+16
Answer: =14x+16
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