a+b=16 is a linear equation in two variables. The variables are a and b. To solve a linear equation in 2 variables we need more information. We need either another equation, or a value to put in for a or b.
Since we have neither, there is no more we can do.
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a=24 b=16 c=18
20
a = 11 and b = 5.
(11, 5)
b = 6