Answer: 4a + 3b + 5c
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Sweetheart to get the answer simply get the two coefficients.
(Coefficients: Numbers that have a variable next to them)
(Variables: A symbol for a value we don't know yet ; Ex. x, y, a etc.)
Then add them together, but since there are multiple variables you add the separately.
a + 3a = 4a (The 'a' alone makes the 'a' become a one)
Then subtract the variables that need to be subtracted.
7b - 4b = 3b
Then since '5c' is the only variable with 'c' you leave it alone as it it.
Finally you mix all variables back together to get.
4a + 3b + 5c
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Hope you have a good day, Loves!~
