The sum (c−4)+(3c+9) is 4C+5
How to find the sum of variables?
- same variables are added or subtracted
- variables with same powers are added or subtracted.
Addition
(c−4)+(3c+9)
⇒C-4+3C+9
⇒(C+3C)+(-4+9)
⇒4C+5
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