r and s can be any values such that r + s = 39. The answer is indeterminate since there are many solutions for that expression. If the new expression is included, then there must be some r and s for the problem.
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10+r = 2r Subtract r from both sides:- r = 10
-9
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r2 + r - 20 = 0(r + 5)(r - 4) = 0r + 5 = 0 or r - 4 = 0r = -5 or r = 4
r = 5k + 5ur - 5u = 5kk = r/5 - u