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5a-3b+12c
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5a-3b+12c
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2a-3b+5c-\left(-3a\right)-\left(-7c\right)
To find the opposite of -3a-7c, find the opposite of each term.
2a-3b+5c+3a-\left(-7c\right)
The opposite of -3a is 3a.
2a-3b+5c+3a+7c
The opposite of -7c is 7c.
5a-3b+5c+7c
Combine 2a and 3a to get 5a.
5a-3b+12c
Combine 5c and 7c to get 12c.
2a-3b+5c-\left(-3a\right)-\left(-7c\right)
To find the opposite of -3a-7c, find the opposite of each term.
2a-3b+5c+3a-\left(-7c\right)
The opposite of -3a is 3a.
2a-3b+5c+3a+7c
The opposite of -7c is 7c.
5a-3b+5c+7c
Combine 2a and 3a to get 5a.
5a-3b+12c
Combine 5c and 7c to get 12c.
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